Florida’s Giant Pythons Are Disappearing — And Scientists Found What’s Hunting Them

[00:00:00]slithering for cover. Conservancy of Southwest Florida just shattered its own record for python removal. They say they caught 177 snakes in Kier County from November of last year to this past April. That brings their total up to 1,750 [music] since 2013.

[00:00:20]>> For 40 years, the Everglades have been wrestling with a problem no one could solve. Burmese pythons spreading out of control and nothing seemed capable of stopping them. Then one morning in Big Cypress, researchers found something that made no sense. 23 Burmese pythons lay scattered across the ground. [music] They ranged in size from young snakes to fully grown adults. All of them were dead, and every single body carried the same disturbing sign. Something had come for them. scooped out the soft flesh, devoured the organs, [music] and left the rest behind like discarded husks.

[00:00:58]Whatever left those marks is still somewhere in this swamp. And it is actively hunting Burmese pythons, the one animal that for four decades had nothing to fear. Over 50 lb and 13 ft long, but dead with its neck ripped apart, buried under the brush. Somehow something killed this apex predator.

[00:01:22]>> So, who or what is doing this? We'll find the answer. But first, we need to understand [music] how Burmese pythons ended up here in the first place.

[00:01:31]Burmese pythons were never native to the Everglades. They arrived through the exotic pet trade, released or escaped into the wild, and then did something no one had anticipated. They stayed, they bred, and they took over the entire ecosystem as if it had always been theirs. Biologically, they are almost perfectly engineered for this. A fully grown python can reach up to 4.8 m in length. After a large meal, its heart can expand by 40% to pump enough blood for digestion. Its skin pattern blends so perfectly with the forest floor that even experienced hunters can walk within a few steps without ever seeing them.

[00:02:14]They can lie motionless for weeks waiting before launching a sudden powerful strike. But what makes them truly dangerous is not their size. It is nothing in the Everglades has ever learned to fear them. In the evolutionary memory of every native species here, Burmese pythons simply do not exist. And when you have no fear of something, you do not run. You simply stand there and become its next meal.

[00:02:40]After 40 years, the numbers are almost too devastating to say out loud. Raccoon populations have plummeted by more than 99%.

[00:02:50]Apossums by 98%.

[00:02:53]Bobcats by nearly 90%.

[00:02:56]24 native mammal species and 47 bird species have been confirmed as prey. The Everglades, America's largest natural water filtration system and the source of clean water for more than 9 million people, is slowly losing the living connections that keep the whole system functioning. Florida fought back hard.

[00:03:15]The python elimination program was launched in 2017. To date, more than 14,000 pythons have been removed. The annual python challenge has produced record results. 294 snakes caught in just 10 days with a $10,000 prize and hundreds of hunters participating. And yet, the python population shows no real decline because a single female can lay up to 100 eggs in one clutch. The math is simple and merciless. Humans cannot win this fight by counting carcasses.

[00:03:48]Those 23 dead pythons found that morning in Big Cypress [music] were not the result of any removal program. There were no hunters in the area. No traps had been set. Whatever killed them had been doing so quietly, long before anyone realized that something else had begun hunting the pythons. Dr. Elena Marsh had spent 7 years at Big Cypress doing one thing, tracking pythons. Not by counting individual snakes, but by monitoring population density in fixed zones using the same methods at the same time each year with the same equipment.

[00:04:23]Her data was so consistent it bordered on boring. Every season the numbers told the same story. Pythons were holding steady or increasing. No exceptions, just a steady upward line across seven full years. Then the eighth season began. In three specific monitoring zones inside Big Cypress, detection rates started to drop. Not dramatically, not the kind of decline anyone would immediately notice, just a small arrow on the graph that began pointing downward instead of up. The next season showed the same pattern. And the season after that, four consecutive seasons, the same quiet decline in exactly the same three zones. In science, a small downward arrow in the right place can matter more than any headline. Marsh spent 3 months systematically ruling out every possible explanation. There were no new hunting programs targeting those areas. Human pressure hadn't increased.

[00:05:24]There had been no natural disasters, no recorded diseases. One by one, all the usual causes were eliminated. Yet, the question remained.

[00:05:33]Finally, she returned to the camera trap archives. Thousands of hours of footage from those exact zones. But this time, she watched differently. She wasn't looking for the python's movement or behavior. She was watching what was happening around them. And in that footage, she found three things.

[00:05:52]Three species. Three behaviors that had never been documented in any scientific literature, quietly achieving what the removal of 14,000 pythons had failed to do. We're going to examine each of them.

[00:06:05]Starting with the smallest and perhaps the most surprising.

[00:06:09]In those thousands of hours of footage, the first thing Marsh saw made her rewind the clip twice. A bobcat. Before we go further, it's important to understand what this animal represents in the Everglades. Bobcats are not apex predators here. They are victims. In areas overrun by pythons, their populations have dropped by nearly 90%.

[00:06:31]They hunt rabbits, rodents, and occasionally birds. They are solitary, maintain large territories, and always avoid anything larger than themselves.

[00:06:40]An adult bobcat weighs between 7 and 14 kg. The python it was approaching weighed 3 to four times that and could have constricted and killed it in under a minute. No scientific paper, no field observation in the entire history of North American wildlife research had ever recorded bobcats exerting meaningful predatory pressure on large constrictor snakes. So, why was the footage showing something that in theory should not be happening? The bobcat stopped at the edge of the nest. It didn't pause out of curiosity and then leave. It stood still and studied the scene carefully. The placement of the nest, the position of the eggs, the angle of the female python's head. It was reading the terrain before moving in. Then it entered. There was no chaos, no rush. It began taking the eggs one by one, methodically, systematically. It was working. Then the female python turned back. The bobcat looked directly at her and didn't run. Instead, it started moving in response to the python's movements, shifting sideways, not backward, always staying just outside effective striking range, its eyes never leaving the snake's head.

[00:07:58]Every time the python changed direction, the bobcat adjusted with it. It never let itself get [music] cornered. It never gave the python the ideal angle to strike. The standoff lasted for some time. In the end, the python gave up. It abandoned its own nest. Wildlife biologist Ian Bartoic watched the footage and said plainly, "Nothing in the scientific literature could have prepared anyone for what they were seeing. But the most important part wasn't the outcome. It was the question that came next. Where did this bobcat [music] learn to do this?

[00:08:35]Not from its parents. There was no precedent in the species. [music] Not from instinct. Bobcats did not evolve alongside Burmese pythons and have no genetic memory of them. It learned on its own through trial, observation of the python's reactions, adjustment, and repeated attempts until it found what worked. And once it succeeded, other bobcats in the area watched and began copying the behavior. By 2025, this behavior had escalated significantly.

[00:09:03]Bobcats and Big Cypress were no longer just raiding nests. They had begun actively hunting adult pythons.

[00:09:10]>> 25lb cat killed and cashed a 52-lb python.

[00:09:14]>> [music] >> One individual was recorded taking down a python nearly 4 m long and twice its own body weight, dragging the carcass into the brush and returning to feed on it over several days. Destroying a nest wipes out an entire clutch. Driving off a female interrupts the incubation cycle, and in natural conditions, that disruption usually means the complete loss of the clutch. It was impressive.

[00:09:39]There was no denying it. But bobcats are solitary hunters. They target one nest at a time scattered across different areas. The footage made that clear. And while this explained part of the decline in Marsh's data, it still didn't explain the 23 dead pythons of various sizes found together in one location at Big Cypress. [music] Marsh kept watching the footage, and the next thing that appeared came from a direction no one in the team had expected. Otter. If the bobcat was unexpected, otter weren't even on anyone's [music] radar. They appeared in no Python management reports. They were never discussed in any scientific conversation about population control.

[00:10:18]An aquatic species that hunts fish and travels along waterways. While Burmese pythons are not aquatic animals, there was no reason to put these two species in the same equation. But just like bobcats, otter in the Everglades have also been victims of the python invasion. Their habitat has shrunk.

[00:10:37]Their young have been taken when separated from the group. This was a species enduring python dominance, not one fighting back against it. [music] Or at least that's what everyone assumed.

[00:10:48]Footage from the waterway areas within the monitoring zones told a [music] different story. Groups of otter ranging from 4 to 12 individuals were moving along the shorelines where pythons typically nest. Not passing through by chance, not random encounters, they moved with purpose, stopping at the exact locations where pythons usually lay their eggs, as if they already knew the terrain. When they spotted hatchling pythons swimming near the surface, [music] they didn't approach from one direction. The entire group attacked from multiple angles at once, hurting the prey into an increasingly narrow space before pulling it underwater. This was the same hering technique they use on fish. Now applied to much larger, slower prey. [music] Hatchling pythons, less than 60 cm long, are weak swimmers [music] with no experience against this kind of predator. The twisting, rolling bite otter use on fish generates far more force than their size would suggest. But that wasn't even the most striking part. When they found an unguarded nest, they didn't hesitate. No scouting, no pausing. The whole group moved in and went to work. 60 to 100 eggs [music] in under 10 minutes, completely gone. Florida's python elimination program with hundreds of trained hunters, GPS tracking, and years of experience removes only a few dozen adult pythons on its best days. [music] One group of otter can wipe out an entire next generation of pythons in 10 minutes. With no budget, no organization, and no press [music] releases, the population level impact forced researchers to look at the numbers again. In areas with high otter density, firstear survival of python hatchlings dropped below 15%. In areas with little to no otter activity, that number ranged from 60 to 70%. That is the difference between a population that is [music] growing and one that is being worn down from the roots before it can even establish itself. The otter were doing something human strategy had overlooked for 40 years. Instead of targeting adult pythons that had already reproduced and contributed to the population, they were cutting off the next generation before it could even exist. But this needs to be said clearly. Otter, small-bodied and [music] hunting in groups, are perfectly suited to handle hatchlings and eggs efficiently. Their contribution to the population decline is real and measurable. However, adult pythons, large snakes weighing tens of kg, are completely beyond their capability. And the 23 dead pythons found at Big Cyprus, were not hatchlings. They were not eggs.

[00:13:29]Bobcats explained part of the story.

[00:13:31]Otter explained more. But even combined, they still couldn't answer the original question. What had killed 23 pythons of various sizes and left their bodies scattered across that one stretch of ground? Marsh kept watching the footage.

[00:13:46]And then something appeared on the screen that made her stop. What she saw wasn't on any list, and it was doing something no one, not even the scientist, thought was possible. Here on the screen was a dark shape moving through the sawrass at 2:00 a.m. It wasn't a bobcat. The movement was different. It wasn't an otter. This was on land. Marsh zoomed in on the footage, and as the image sharpened, [music] she realized she was looking at something no one in the research team had ever put on their watch list. [music] A coyote, an animal most Fidians see on the side of the road and [music] drive past without a second thought. A species that appeared in no python management reports. An animal that physically at 11 to 16 kg had no business confronting the largest snake in North America. But the footage that followed showed it wasn't confronting the python headon. It was waiting. This was what the coyote had figured out. Something even researchers who had spent decades studying pythons had never considered as a point of vulnerability. Burmese pythons are nearly invincible, but not all the time.

[00:14:56]There are specific windows in their biological cycle when their advantages in size and power nearly disappear. The first window after swallowing large prey, all blood flow is redirected to the digestive system. Muscle strength drops significantly and the ability to constrict is almost gone for several hours. The python lies still looking normal. But if attacked during this time, it cannot respond the way it normally would. The second window, while incubating eggs, the female coils tightly around the nest, focused entirely in one direction.

[00:15:32]creating a wide blind spot behind her that her side-facing eyes cannot cover.

[00:15:36]The third window, during shedding, a membrane covers the eyes, reducing vision to nearly zero for several days.

[00:15:44]The python moves slowly, reacts slowly, and relies almost entirely on smell to navigate. The coyotes had learned to recognize all three of these windows.

[00:15:55]And from that knowledge, they developed a technique that forensic analysis later helped researchers fully understand.

[00:16:02]They approached from a 30 to 45° angle behind the python's head, precisely in the blind spot created by the snake's side vision. A single bite to the skull, then immediate retreat before the python can reorient. [music] The brain is the most nutrient-dense part of the python's body. That's why they take only the head. Not because the rest isn't edible, but because it offers the highest reward for the shortest time spent in danger in Take What You Need, Disappear. That is why the 23 dead pythons found at Big Cypress looked almost completely intact, except for one thing. They were missing their heads.

[00:16:41]But here's what's truly remarkable. The coyotes in Florida did not bring this behavior with them from somewhere else.

[00:16:48]No coyote population anywhere in the world has ever been recorded hunting pythons this way before. This was something invented right here by individuals who tried, failed, adjusted, and eventually found a method that worked. Then the method began to spread.

[00:17:05]One individual succeeded. Others watched, they copied, they refined, they tried again. Not through genes, not through instinct, but through watching each other and learning. Scientists call this cultural transmission, the passing of knowledge and behavior in wild animals. Crows learn to drop nuts onto roads to crack them open. And that behavior spreads from one bird to another in the same area. Orcas learn to deliberately beach themselves to hunt seals, then teach it to their calves across generations.

[00:17:40]Chimpanzees pass on the technique of using sticks to fish for termites, a tool that becomes shared knowledge within the community. The coyotes in Big Cypress were doing the same thing with a prey species no one thought they could possibly reach. The evidence was right there in the data. The number of headless python carcasses increased steadily from 2021 to 2023. Not a sudden spike, but a smooth continuous upward curve. That is not the curve of random chance. That is the curve of knowledge being shared and refined within a community. Now, put all three together.

[00:18:16]Bobcats attack nests, destroying entire clutches, driving off mothers, and gradually learning to take down adults as well. Otter wipe out the next generation before it can even swim on its own. 60 to 100 eggs gone in under 10 minutes. Coyotes wait for precise biological weak points, approach from the blind spot, take only what they need, and vanish without a trace. three layers, eggs, hatchlings, adults.

[00:18:44][music] There is no stage in the Burmese python's life cycle that at least one of these three species isn't targeting. And no one planned any of this. There was no coordination between bobcats, otter, and coyotes. No signals, no shared strategy, just three species, each discovering its own solution that together created something 40 years of organized human effort had failed to achieve. That is the most astonishing part of this entire story. Marsh looked back at their own charts. Four consecutive seasons, three monitoring zones, the same steady downward trend. Da a small arrow that kept pointing down without wavering.

[00:19:27]And for the first time in 7 years of working here, she understood why. It wasn't because humans had done anything more. It wasn't the weather. It wasn't a new program. It wasn't any factor that normally has a box to check in a scientific report. It was because three native species, each in its own way in the same area during the same period, [music] had figured out how to do what 40 years of organized human effort had failed to achieve. This was the first time in 40 years that the Burmese python population in parts of Big Cyprus showed real signs of decline. not from outside pressure, but from forces rising within the ecosystem [music] itself. But this needs to be said clearly. This is not victory. The python population across the Everglades is still estimated between 100,000 and 300,000 individuals.

[00:20:22]Their reproductive capacity remains unchanged. A single female can still lay up to 100 eggs in one clutch. The declining zones inside Big Cypress represent only a small fraction of the species total range. Human removal programs must not only continue, they need to expand. Yet, something fundamental has changed and it cannot be ignored. For the first time in 40 years, this ecosystem is no longer just enduring. It is responding. and three species with no budgets, no strategic plans, and no press releases are doing it more effectively than any initiative humans have ever launched here. This raises an uncomfortable question for everyone who studies and manages damaged ecosystems. If we spent less time counting what we can remove and more time observing what is already happening inside the system, would we have noticed this earlier? Or has the answer been here all along? We just weren't looking in the right place. Three species, three different approaches, and an ecosystem doing something no one planned for it to do. Bobcats are still learning. Otter are still clearing out nest after [music] nest. Coyotes are still moving through the darkness at 2:00 a.m. And their knowledge continues to spread through the community in ways no camera can fully capture.

[00:21:41]The question is not whether the Everglades can save itself. The question is, how many other ecosystems are quietly doing the same thing right now that we simply haven't noticed because no one has looked in the right place yet? If this video changed the way you see what's happening in the Everglades, share it with someone who needs to know and leave your thoughts in the comments below. Dr. Michael Kirkland has been tracking Burmese pythons in the Everglades for over a decade. He knew every movement corridor they used, every breeding site, every mating season. But last year, for the first time, he started to notice something different.

[00:22:19]The snakes that were fitted with tracking devices began to stop moving.

[00:22:23][music] At first, only a few. He thought the equipment was malfunctioning. Then 20, then 30. When his team reached the coordinates, they found the bodies.

[00:22:34]Large, healthy snakes lying dead close together in a narrow area. No bite marks, no claw marks, no signs of any fight. Nearly a hundred snakes dead with no explanation.

[00:22:47]>> After investigators found about a hundred dead snakes.

[00:22:52]>> In more than 20 years in the Everglades, no species has ever done this to Burmese pythons. So someone has. To answer that, you need to know one thing first about this place. The Everglades [music] is not the place where a killer leaves their calling card. The story of Burmese pythons in the Everglades has been told many times. The invasive reptile, the destroyed ecosystem, the vanished mammals, the endless hunt. But there are things lying beneath that story. Never told or never told the right way. Last hunting season alone, researchers pulled 177 pythons from the swamps, weighing more than 3,600 kg in a single area only. The largest number ever recorded.

[00:23:40]celebrated as a victory.

[00:23:43]At the exact same time, scientists analyzing the DNA of hundreds of captured snakes discovered something else. Some of them were no longer pure Burmese pythons.

[00:23:54]>> While we were looking at the Burmese python population in Florida, um we found a small number of these animals um appeared to be introgressed with Indian pythons. They were now hybridizing with a related species, creating offspring generations that could survive in environments where pure pythons could never set foot. That means the Everglades has never been their final limit. [music] It was only the beginning. And there is one more thing.

[00:24:21]While everyone is staring at the pythons, something else is quietly spreading across the entire ecosystem.

[00:24:28]It has no fearsome shape, no gigantic size, smaller than the tip of your finger, and cannot be seen by the naked eye. That thing has now separated from the pythons. It no longer needs snakes to survive, and is killing every native snake species in a way that no one can stop. And all of it started from a fact that everyone knows. But no one has ever truly thought about its consequences.

[00:24:55]Burmese pythons in the Everglades have no natural enemies, not one species. To understand why these deaths were so unusual, you first need to understand where the Burmese python sits in this ecosystem. No species in the Everglades has evolved to hunt them. Not because Burmese pythons are invulnerable, but because they have not been here long enough to develop natural enemies.

[00:25:20]They arrived in this place less than 40 years ago. While the native predators require thousands of years of evolution to recognize, react to, and adapt to a brand new threat. Crocodiles have been recorded attacking small pythons.

[00:25:36]Florida panthers have been caught on camera traps lying in weight on a python for 20 minutes before moving in. Bobcats have been seen dragging a python carcass through the mud. But these are individual animals learning on their own, not a population that has evolved a strategic hunting strategy. And none of them could explain what Dr. Kirkland's team was seeing. Nearly 100 pythons dead in clusters, no signs of attack.

[00:26:04]Kirkland had ruled out every possibility one by one. If it were crocodiles, there would be wounds. Crocodile jaws leave unmistakable marks. If it were Florida panthers or bobcats, there would be claw marks, teeth marks, and torn body parts.

[00:26:21]And more importantly, there are currently fewer than 200 Florida panthers in the entire state. They could not kill nearly 100 pythons in a narrow area without leaving [music] any traces.

[00:26:34]If it were humans, there would be evidence left behind. Footprints, traps, bullets, nothing. These pythons died from the inside. But from the inside, in what sense? That is the question Dr. Kirkland's team carried back to the lab.

[00:26:50]They began dissecting the carcasses. And what they found inside those pythons was not what they were looking for. Their lungs, not empty, not damaged from the outside, were packed full of tiny, pale, transparent creatures, wrapping around each other into dense clusters inside the respiratory tract. In pythons that were still alive during the autopsy, you could see them moving, poking out from their mouths that were wide open but too weak to close. This was not a wound.

[00:27:21]This was not a normal disease. This was something living inside them, eating, growing, reproducing until there was no longer any room left to breathe.

[00:27:32]The answer to the mystery in the swamps is not a larger hunting species. It is smaller than the tip of [music] your finger, and it has been here longer than anyone realized. The name of it is Rileyella orientalis, not bacteria, not a virus. a parasitic worm, also known as a lungworm, with origins in Southeast Asia. And it arrived in Florida in a way that no one could stop inside the bodies of the Burmese pythons themselves.

[00:28:01]In Southeast Asia, the relationship between lungworms and Burmese pythons had existed for millions of years, long enough for the python's immune system to learn how to control the parasite population at a level that caused no serious symptoms. Pythons carried them, but they did not die from them. Pythons were only the transport vehicle. The problem began the moment the transport vehicle set foot in an ecosystem that had never been exposed to the passenger it was carrying. Dr. Terren Ferrell of Stson University was the first to notice the abnormality, not with the pythons, but with Florida's native snake species.

[00:28:40]striped snakes, dwarf pygmy rattlesnakes, eastern diamondback rattlesnakes, all species that had been healthy and abundant, began appearing in poor condition, listless, mouths gaping because of breathing difficulty.

[00:28:54]When his team dissected the carcasses, they found exactly what Dr. Kirkland's team had found in the lungs of the mysterious dead pythons. The exact same species, the exact same mechanism, but with one critical difference.

[00:29:09]Burmese pythons had millions of years of evolution to tolerate them. Native Florida snakes had not had even a single day. Frell described it as the first contact between European explorers and isolated indigenous communities. One side carrying a disease their bodies had already adapted to, the other side with no defense mechanisms at all. The consequences history had already [music] recorded. The transmission mechanism of the lungworm does not require direct contact between pythons [music] and native snakes. It works through a chain that the ecosystem had been running normally long before humans arrived.

[00:29:46]Pythons shed eggs through their waste.

[00:29:48]Flies, ubiquitous in the swamp, eat the waste and absorb the eggs. Native frogs eat the flies. Native snakes eat the frogs. No step in that chain was abnormal. That is how the ecosystem has always operated. But now every link in that chain was carrying a death sentence. When the eggs entered the body of a native snake, they pierced through the stomach wall, moved to the respiratory system, attached to the lungs. Then they fed, grew, reproduced.

[00:30:19]Over weeks, over months, the breathing path gradually filled. The snake weakened day by day. Frell called it drowning in slow motion. Dr. Dr. Melissa Miller of the University of Florida later determined the entire range of infection. At least 18 different native snake species had been confirmed infected. The geographic range stretched all the way to Jacksonville, hundreds of miles north of the core Everglades area.

[00:30:47]But this was not yet the most frightening part. The most frightening part was what Miller discovered next and according to her made her go cold when she looked at the data. The lungworm no longer needed Burmese pythons. The parasite had completed the host switch.

[00:31:04]It had established a self-sustaining transmission cycle, operating entirely through the community of native snakes, flies, and frogs without any involvement from any python at all. What does that mean in practice? Even if tomorrow all the Burmese pythons in Florida disappeared, the lungworm would still be there in the flies, [music] in the frogs, in every native snake slowly suffocating in the darkness of the swamp. The typical outcome of a biological invasion [music] ends when the invading species is removed. This invasion did not. It had already embedded itself into the ecosystem in a way that could not be erased [music] simply by removing its original source.

[00:31:46]And that is why the pythons in Kirkland's swamp died in clusters without any marks. There was no outside attacker. The attacker had been inside them from the moment they first set foot in the Everglades. So lungworms are ravaging the ecosystem from within. But while that is happening, the remaining pythons themselves are not standing still. They are changing. In 2018, researchers from the US Geological Survey collected tissue samples from 426 pythons caught across a wide area throughout South Florida. This was routine monitoring. No one was looking for anything unexpected. But when the DNA analysis results came back, something didn't match. 13 of those pythons were not purebred [music] Burmese pythons. They were hybrids. One of their parents carried the genes of the Indian python, a close relative, also once kept as a pet, also released or escaped into Florida in previous decades. The two populations had met in the swamps, and they had interbred.

[00:32:53]13 individuals sound small, but these were the ones we caught and [music] managed to test. No one knows how many hybrids are moving through areas where humans have [music] yet to set foot. And here is why this discovery is more alarming than any population figure.

[00:33:09]Pure-bred Burmese pythons are creatures of the swamp. They favor water, mud, dense vegetation. The Everglades is their ideal habitat, but also their natural boundary. Indian pythons are different. They prefer higher, drier terrain, forests, grasslands, suburbs.

[00:33:29]If a hybrid inherits the adaptive traits of both species, it is no longer confined to the wetland ecosystem.

[00:33:37]The Everglades was once a geographic trap that kept the pythons in one place.

[00:33:42]A hybrid may not be held by that trap.

[00:33:44]But the genetic problem does not stop there. Researchers [music] also discovered another phenomenon within the same population known as polyandri.

[00:33:54]A single female can be fertilized by multiple males in one reproductive event. A single clutch of eggs can contain offspring from entirely different genetic sources. Under normal conditions, this is an evolutionary mechanism that helps a species diversify slowly over centuries. [music] Under invasive conditions, with tens of thousands of individuals breeding simultaneously, it is a machine generating genetic diversity at a rate no model can keep pace with.

[00:34:23]And then there was one more finding, something even the researchers did not anticipate.

[00:34:29]In 2025, a study published in the journal of zoologology [music] documented this. Burmese pythons are dispersing plant seeds through their digestive systems. As they move across the ecosystem, they consume forgivorous animals. Seeds pass through their bodies. Then they travel kilome before [music] being expelled. They are not merely eating the ecosystem. They are reshaping its botanical landscape. That means even in the best case scenario, even if all the pythons vanish tomorrow, the vegetation of the Everglades over the coming decades will bear the imprint of their presence. Tree species growing where they do not belong. Ecological corridors altered in ways no [music] one planned. Burmese pythons have been in the Everglades long enough to no longer be mere invaders. They are becoming part of the architecture of this place. And that architecture is changing with every generation. Amid all of that, something is moving in the opposite direction. Not humans, not technology, [music] not traps or drones or hunting programs.

[00:35:35]A snake. Dry marshon couperryi. The eastern indigo snake. The longest native snake in North America. Its scales are so purely black that under direct sunlight they refract light into a shimmering iridescent green. The word researchers use most often when encountering one in the field is not impressive or intimidating.

[00:35:59]The word they use is beautiful. But beauty is not why this species matters.

[00:36:05]It matters [music] because it eats snakes completely immune to the venom of every pit viper in North America.

[00:36:12]Rattlesnakes, cotton mouths, copperheads. The indigo overpowers them all through jaw strength and body mass, swallowing them head first while the prey is still writhing. Dirk Stevenson of [music] the Orian Society calls it the emperor of the forest floor. At the ground level of the southeastern forest, nothing can challenge [music] a fully grown indigo snake. But the emperor had vanished. The eastern indigo depends on gopher tortoise burrows for shelter. As Florida's wave of urban development transformed native long-leaf pine forests into residential and agricultural land, gopher tortoise populations declined and the indigo declined with them. By 1978, they had nearly disappeared [music] entirely from northern Florida. More than 50 years of absence.

[00:37:01]Then in 2017, the Orian Society began releasing captive bred indigo snakes into the Appalachiccola Bluffs and Ravines Preserve.

[00:37:10]>> Dozens of snakes were released into the wild in North Florida to eat other invasive snakes.

[00:37:16]>> Not simply releasing snakes, but reconstructing the entire longleaf pine ecosystem they need to survive.

[00:37:23]understory vegetation, controlled burn regimes, gopher tortoise populations dense enough to provide a network of burrows. It took years of preparation, but they did it. And then in the autumn of 2023, a monitoring camera placed at the entrance to a gopher tortoise burrow captured something that Durk Stevenson had to watch 11 times before he trusted his own eyes. Two juvenile indigo snakes, not released individuals, no longer than a pencil, moving with the unhurried confidence of a species with no meaningful predators. Born in the wild, conceived in the wild, hatched in the wild without any human assistance.

[00:38:06]For the first time in more than 50 years, the eastern indigo snake had reproduced on its own in northern Florida. As of 2025, the total number of indigo snakes released across Florida and Alabama has surpassed 500 [music] individuals. Spring surveys from 2024 to 2025 confirmed that multiple individuals from earlier releases remain alive and are integrating into the ecosystem. In late 2024, biologists documented a male nearly 2 m in length, evidence of the health and longevity of a population slowly taking shape. The emperor is not merely returning. The emperor is rebuilding.

[00:38:48]But here is the question no one can answer with certainty. The eastern indigo is moving southward toward the ecosystem that needs it most. A juvenile python under 1 and 1/2 m falls within the range an indigo can dominate.

[00:39:03]Against smaller pythons, the indigo almost certainly prevails. But a fully grown female python 4 and 1/2 m long, weighing nearly 90 kg, that is an entirely different story. When asked about such an encounter, Stevenson always responds the same way. Honestly, I don't know. No one knows. No one has ever observed that in the wild.

[00:39:26]And then there is an even more troubling question. The lungworm is spreading northward in the exact direction the indigo is moving southward. The indigo's venom immunity is highly specific, tied to molecular structures in its blood.

[00:39:40]There is no reason to believe it extends to a parasitic worm with an entirely different biological architecture. If the lung worm reaches the indigo population before it achieves self- sustaining density, the recovery ends before it begins. Back to the question from the beginning of the video. What is killing the pythons in Kirkland swamp?

[00:40:01]Now you know the answer. Not a larger predator, not humans, not traps or technology, but something the pythons themselves brought here. And that is now turning against them. But that is not the most thought-provoking thing from this story. The most thought-provoking thing is this. Throughout natural history, no large-scale biological invasion has ever been completely eradicated by human effort. Not once.

[00:40:31]What actually happens is not elimination, but the establishment of a new equilibrium, an ecosystem different from what once existed with new rules, with new species filling roles that no one held before. The Everglades of 30 years ago no longer exists. The question is not how to get it back. The question is, what will the Everglades of 30 years from now become? And who will decide that? If the eastern indigo arrives in time before the lungworm cuts off its path, there may be an equilibrium in which the python population is [music] suppressed from below through juveniles that never get the chance to grow. Not elimination, but containment. If not, if the lungworm arrives first, then the one thing capable of shifting the balance will be gone before it can do anything at all. And the Everglades will continue changing in a direction no one chose.

[00:41:29]Kirkland is still placing cameras in the swamp. Still driving out every 6 weeks, retrieving the memory cards, loading the footage late at night. The work has not changed, but what he is looking for has.

[00:41:41]He is no longer just counting pythons.

[00:41:44]He is watching an ecosystem decide what it is going to become. And the speed of that decision is outpacing the speed of our understanding. The real question is not whether we can eliminate all the pythons. The question is, can we understand fast enough to still have a choice before evolution decides for us?

[00:42:06]That night, the satellite signal suddenly stopped. Biologist Mark Feller had been tracking it for weeks. A Burmese python more than 4 m long, one of the most fearsome predators to ever invade the Everglades.

[00:42:19]But that night, the signal dot on his screen no longer moved. When he reached the coordinates deep in the swamp, what he saw made him freeze [music] in place.

[00:42:29]The python's head was gone, completely bitten off. It wasn't a wound he had ever seen in over 20 years of studying this reptile. Not the kind of injury from a struggle with an alligator, nor any mark left by a human [music] who had ever set foot in that place. This was the creature that had wiped out 99% of the mammals across an entire [music] swamp region. It had once swallowed an entire armored alligator hole until the meal caused it to explode. This is a python's last meal.

[00:42:58]>> Scientists at a Florida lab inspecting the snake, they say they couldn't believe their eyes when they opened the snake to find the alligator pretty much intact inside.

[00:43:06]>> Nothing in Florida's natural world had ever dared to touch it. So, what had just killed a monster with no natural enemies? The answer, it turned out, was not a new and [music] more terrifying predator. It was something the scientific community had never even considered. But before we get to that, let's go back to the beginning. This story did not begin with a wild python.

[00:43:28]It began in the living rooms of reptile enthusiasts. In the 1980s, when the exotic pet trade exploded in South Florida, Burmese pythons became the most sought after commodity. People were willing to spend large sums of money to import rare individuals with unique, striking skin patterns from Southeast Asia. Sellers reassured buyers, "This species eats very little and won't grow much larger. Reality was the complete opposite. They grew without stopping.

[00:43:57]Their food requirements increased month after month. An animal that once fit comfortably in the palm of a hand now demanded whole chickens, rabbits, and eventually even larger prey. Many owners, shocked to find a creature several meters long living inside their own home, chose the simplest solution, driving out to the edge of the Everglades and releasing it into the wild. Then, in 1992, Hurricane Andrew made landfall, tearing apart numerous roadside python breeding facilities. A large number of mature, selectively bred individuals escaped into the wild all at once. From just a few dozen escaped snakes at the beginning, combined with the steady stream of people continuing to dump their unwanted pets for years afterward, an empire gradually formed, now estimated to number in the hundreds of thousands stretching from Lake Okichchobee all the way down to Keargo.

[00:44:50]What made Burmese pythons a nightmare was not just their sheer numbers. It was their patterned skin, once surprised by collectors, that turned out to be nearly perfect camouflage, allowing a creature several meters long and weighing dozens of kg to completely disappear among the mud and dappled light. Many researchers have admitted they could stand less than 2 m from a fully grown python without ever realizing it was there. Along their jaws, they also possess extremely sensitive heat sensing pits. They don't see with light. They see [music] with the body heat of their prey. In the absolute darkness of the swamp, a rabbit or a raccoon has no way to hide from this biological weapon. Their diet is also virtually unlimited. From birds and marsupials to bobcats and medium-sized deer, a Burmese python's jaws can stretch wide enough to swallow prey larger than its own head. And with an adult female capable of laying up to 100 eggs in a single clutch, their reproductive rate far outpaces any human ability to control them. But perhaps their greatest advantage is deceptively simple. This is a land with no natural enemies. In their native range in Southeast Asia, Burmese pythons must compete with tigers, leopards, and other large predators. In the Everglades, no creature had ever evolved to even recognize, let alone deal with, a stealthy ambush predator of this size.

[00:46:21]More alarmingly, geneticists have found traces of hybridization between the Florida population and a related python species from India.

[00:46:29]>> While we were looking at the Burmese python population in Florida, um we found a small number of these animals um appeared to be introgressed with Indian pythons. an unexpected genetic mixing that has made this invasive population even more adaptable and resilient than any model had predicted. The result is a creature with overwhelming numbers, superior senses nearly invisible to its prey, and no natural opponent in Florida strong enough to stand in its way. Only one name remained that could possibly challenge it. That name did not belong to a mammal, nor to a bird of prey. It belonged to the only creature that had ruled these waters long before humans ever set foot in Florida, the American alligator.

[00:47:13]>> New twist after an alligator was [music] seen dragging a massive python. There's been an allout effort the last several years to eradicate invasive pythons from the Everglades and gators are helping in that fight.

[00:47:25]>> This was not merely an animal. It was a dynasty. A biological design perfected over more than 10 million years of evolution. Its weapon was a set of jaws with a bite force exceeding 2,000 lb per square in. To put that in perspective, a lion's bite is around 1,000 psy, while a human's is less than 200. An alligator's jaws don't just bite, they crush bone like dry twigs. Its defense was equally formidable. Real bony plates woven directly into the skin of its back, forming a living suit of armor. And when it needed to finish off its prey, it employed its infamous death roll, an explosive spinning motion powerful enough to tear apart any limb caught in its grip. [music] For 10 million years, this creature had almost no natural enemies. But the Burmese python fought in an entirely different way. Its jaws were not made for crushing, but for hooking, rows of backward curving teeth that ensured prey could only be pulled inward, never escape.

[00:48:31]And once its body had wrapped enough coils around its victim, it began to squeeze. This was not the steady, constant pressure of legend. With every exhale from its prey, the coils tightened a little more until the pressure became great enough to cut off blood flow and stop the heart in under a minute. As these two giants began to clash in the swamps, where smaller prey was growing scarce, biologists started recording scenes never seen before. They found the carcasses of enormous pythons floating on the water, their bellies torn open from the inside. Evidence that even after being swallowed, the alligator's armor and claws had [music] managed to deliver a final fatal blow.

[00:49:13]But they also found the reverse.

[00:49:16]Alligators lying motionless, their bodies covered in the distinctive spiral bruises left by a lethal constriction.

[00:49:24]Nothing prepared them for the discovery.

[00:49:25]In 2005, a 4 m python was found floating on the surface, its body completely split in two. Protruding from the ruptured torso were the armored tail and hind legs of a nearly 2 m alligator.

[00:49:39]The python had swallowed an opponent nearly its own size. An act of such arrogance that the sheer mass of its meal had become the very thing that killed the victor. It was a battle in which both sides lost. a creature capable of bringing down the 10 million-year-old king of the swamp. So, what if anything could still make it pay the price? The answer, it turned out, did not come from a larger predator. It came from something no one expected.

[00:50:05]Returning to the scene where this story began, a python more than 4 m long. Its head completely [music] bitten off. No alligator tooth marks, no constriction marks, no signs of human involvement.

[00:50:17]After weeks of analysis combined with data from nearby trail cameras, Mark Feller's research team finally >> [music] >> identified the culprit. It was not some new giant predator. It was a bobcat, a native North American lynx.

[00:50:31]>> 25lb cat killed and cashed a 52lb python.

[00:50:36]>> An animal weighing less than 15 kg, only slightly larger than a big house cat.

[00:50:42]For many scientists who had spent their careers studying the Everglades, this was almost unthinkable. In two decades of monitoring the invasive python population, they had never recorded a medium-sized native species actively taking down a large adult python. Not in self-defense, but in a decisive offensive attack. But this did not happen by chance. A few days before the satellite signal stopped, a record-breaking cold front had swept through South Florida. Temperatures dropped unusually low for several consecutive nights. Pythons are coldblooded. Their reflexes, muscle strength, and defensive capabilities depend entirely on environmental temperature.

[00:51:24]>> Our cold snap is changing how python hunters track down the invasive snake in the Everglades. Cold helps the hunters.

[00:51:31]>> When temperatures plummet, their bodies slow down, sometimes to the point of near paralysis for hours. That was the moment the balance of power reversed. A predator that had been invisible and seemingly invincible under normal conditions suddenly became a slow, vulnerable target right when a hungry bobcat [music] happened to pass by. This was not an isolated case. A few months earlier, Feller's team had found evidence of another tracked python being attacked and killed by a Florida black bear, also during a similar cold snap.

[00:52:04]And at another preserve in Big Cypress, trail cameras had captured [music] a bobcat erading an unguarded python nest.

[00:52:11]The first time scientists had ever recorded any Florida animal actively preying on the invader's eggs. It felt like a point for the home team, one ecologist said after watching the footage for the first time. After years of only seeing native wildlife being hunted, this was a rare moment when they [music] saw the reverse. But the story did not end there. And this is the part that forced the entire research community to reconsider everything. The very same deadly cold snaps that had once killed large numbers of pythons, once thought to be nature's only real weapon against the invasion, were now creating intense selective pressure.

[00:52:51]Only the individuals better [music] able to tolerate cold, survive to reproduce.

[00:52:56]And with each generation, the remaining python population was gradually adapting to harsher conditions. faster than anyone had predicted. In other words, every time nature found a rare opportunity to fight back, that same opportunity was quietly [music] training a more formidable version of the opponent. It was a brutal feedback loop in which no one truly won outright, only continuous adaptation from both sides.

[00:53:23]And amid this loop, scientists discovered an unexpected use for the invader itself. Every python [music] captured during surveys was no longer simply removed. Its body was now being sampled to measure levels of long persisting pollutants in the water. As a top generalist predator that accumulates chemicals through the entire food chain beneath it, the Burmese python had unintentionally become an extremely effective natural bioindicator for the overall health of the Everglades ecosystem. The creature that once caused an ecological collapse was now helping humans more accurately measure the damage the [music] swamp was enduring.

[00:54:02]The bobcat that killed the python at the beginning of this story was not an isolated incident. The deeper the researchers looked, the more they realized. The list of native species willing to stand up and challenge the invader was growing longer than expected. And each species [music] had a completely different way of fighting back.

[00:54:22]The American alligator, the age-old enemy we [music] already knew about, turned out to have a far more complex relationship than initially [music] imagined. With small and medium-sized pythons, alligators were not just equals, they were actual predators. Only when a python grew beyond a certain size threshold [music] did the balance shift into the kind of life or death struggle we saw. The Florida black bear was a different case. Unlike the bobcat, which relied on [music] speed and agility, the black bear used something the python completely lacked. Pure muscular strength combined with proactive ambush attacks. It didn't wait for the prey to weaken first. Several recorded cases [music] involved black bears attacking even tracted pythons, causing their satellite signals to suddenly disappear.

[00:55:08]Exactly the [music] kind of scene Mark Feller's team had to investigate. The Florida panther, one of America's rarest and most endangered big cats, has also been documented taking down adult pythons. This is a striking paradox. The very species most [music] in need of protection has become one of the most effective potential biological weapons against the invader.

[00:55:32]But perhaps the biggest surprise came from above. Vultures, the familiar scavengers of the swamp, were recorded not only waiting for carcasses, but actively raiding unguarded python nests, much like the bobcat had done. For a species that reproduces slowly and has few natural enemies, this represented a completely new adaptive behavior. It seemed the sudden abundance of pythons had unintentionally created a new food source [music] that the birds had learned to exploit. Interestingly, most of these counterattacks targeted [music] the most vulnerable stages in the python's life cycle, either when they were still eggs or when their bodies were paralyzed by cold. No native species in Florida had developed the [music] ability to directly confront a healthy fullgrown python under normal conditions. What was gradually forming was not a single nemesis, but a scattered network of pressures coming from many directions and at different times. This is precisely how a heavily damaged ecosystem can begin to restore its own balance. Not through one overwhelming victory, but through countless small cuts inflicted by creatures no one had ever expected to fight back. While nature is finding its own brutal way to rebalance itself, humans have not stood on the sidelines either. Since the mid2010s, Florida created a job that had never existed before. Professional python hunters state recognized and paid by the animal, patrolling the levies and canals behind the Everglades, often deep into the night when pythons are most active. But even the most experienced hunters admit this is a nearly impossible fight. A python's camouflage is so perfect that a person can stand less than 2 m from a full-g grown adult and never know it's there. To improve their odds, scientists turn to a more sophisticated tactic.

[00:57:21]Surgically implanting radio transmitters into male pythons before releasing them back into the wild. During breeding season, Instinct drives these males straight to the largest females, leading researchers directly to breeding hotspots buried deep in the swamp that humans could never find on their own.

[00:57:38]This exact technique is why Mark Feller's team was tracking the python from the opening of this story and how they unwittingly became witnesses to nature's first counterattack. This effort is reinforced by a major annual event, the Florida Python Challenge.

[00:57:53]2025 was called a double record year by experts. 900 participants removed 294 snakes, the highest number since the competition began in 2013. A Florida woman beat out 933 other competitors and was crowned the 2025 Python Challenge champ.

[00:58:14]>> That same year, a hunting contractor standing under 1.5 m tall, Taylor Stanberry, became the competition's first ever female champion, catching 60 pythons, including one measuring over 2 m. [music] By 2026, the 9th edition of the challenge ran for 10 days, drawing roughly 1,000 hunters from the US and Canada with total prize money raised to a record [music] $25,000. The rules also tightened. No firearms, no hunting dogs, only air guns or approved humane on-site kill methods. But this year's most striking detail didn't come from a hunter at all. It came from a machine.

[00:58:53]The South Florida Water Management District working with the University of Florida deployed 120 robotic rabbits across key habitat zones. Mechanical decoys engineered to exploit the very sense that makes python [music] so terrifying. Their ability to detect a praise body heat in total darkness. For the first time, humans were turning the invader's own biological weapon back against it. Cumulatively, more than 23,500 pythons have been removed from Florida since 2000. An impressive number until you weigh it against the current population. Hundreds of thousands of individuals spread across a vast, largely inaccessible wilderness. A US Geological Survey assessment put it bluntly. A short public hunting event like this is not a realistic way to eliminate the species entirely. And officials don't deny it because the real goal was never total eradication. The goal is to slow the invasion spread, protect what remains of native wildlife populations, and by time, time for nature itself, slowly and brutally to keep searching for its own new [music] balance. The python with its head bitten off at the beginning of this story was not the end of a tale. It was the opening of an entirely different story, one that the scientific community is still writing day by day. What remains unchanged is the bitter truth at the root. Everything happening in the Everglades today stems from a chain of human decisions, a collector's hobby, a misleading sales pitch, a fateful hurricane, and countless moments when people chose to set an animal free rather than face the responsibility of having created the problem. What has changed, however, is how we understand the rest of the story. This is no longer simply the image of an all-conquering invader silently claiming every inch of unprepared land. Today's Everglades is a far more complex battlefield, a place where both the invader and the native species are being forced to adapt, to evolve, and to pay costs in ways no one could have predicted. A bobcat learns to exploit a rare weakness in its enemy. A python population learns to endure the cold that was once its only natural weapon. And humans standing in the middle of it all are both the cause of the disaster and are now trying to become part of the solution. None of us know for certain where the final balance will settle. It is possible that the Burmese python will permanently [music] remain the top predator in the Everglades. It is also possible that over the coming decades, nature [music] will slowly find a way to rebalance its own order. gradually, brutally, but far from powerless as we once believed. So, the final question is for you. Is this still a war that humans have a chance of winning? Or is this a permanently changed new world? One that all of us, including nature itself, must now learn to live with. Feel free to share your thoughts in the comments below. This is truly a conversation worth exploring together. Thanks so much for watching until the end. If you liked the video, please hit like and subscribe to World Enigma. It really helps me keep making more content like this. See you in the next one.