Burmese Pythons Are Disappearing in Florida — Scientists Found What's Been Killing Them All Along

Added: 2026-05-05

[00:00:00]Burmese pythons have devastated native wildlife in the Everglades.

[00:00:04]>> A wildlife biologist working a tracking grid inside the Everglades pulled the signal from a transmitter attached to a python her team had been monitoring for 11 weeks and drove to the coordinate before sunrise.

[00:00:17]The signal had been stationary for 4 days. Stationary was normal. Pythons hold position for extended periods after feeding. She pushed through the last section of saw grass and found the animal exactly where the transmitter said it would be. All 4 and 1/2 m of it.

[00:00:36]Every scale intact. Every part of the body present and accounted for except one. The head was gone. Not damaged. Not partially consumed. Gone. Removed with a cleanliness that left the rest of the body essentially undisturbed. No drag marks. No blood trail, no sign of the struggle you would expect from an attack on a 40 kg ambush predator, just the snake and the silence and the sawrass moving slightly in the early morning air. She stood over that carcass for several minutes before she called her supervisor. When he answered, she said four words. You need to see this. Stay with Terraactor as we pull apart one of the most unexpected ecological stories unfolding right now inside the Florida Everglades. Because what is happening to Burmese python populations in specific zones of South Florida is not what any removal program produced. And the full explanation raises a question that nobody working in Florida wildlife management has a confident answer to yet. a question about whether the thing that might finally turn this story around could be destroyed before it ever gets the chance to work. To understand why that question matters, you first need to understand what 40 years of python dominance actually did to this ecosystem.

[00:02:06]The Everglades is not simply a swamp. It is a slowm moving river of grass covering 1 and a half million acres across South Florida, filtering drinking water for more than 9 million people, absorbing storm surge, regulating weather patterns across the entire southern peninsula. Scientists have calculated its ecological value at over $ 31 billion annually from what it does rather than what it contains. When the food chain inside that system begins collapsing, the consequences extend far beyond the animals themselves.

[00:02:43]Burmese pythons arrived through two pathways. Throughout the 1980s and 1990s, they were among the most popular exotic pets in America. Sold at reptile shows as juveniles for a few dollars.

[00:02:57]What buyers rarely considered was what happens when a snake that fits in a child's hands becomes a 4 meter animal that outweighs most adult men.

[00:03:08]Overwhelmed owners drove to the edge of the Everglades and released them. Then in 1992, Hurricane Andrew destroyed a reptile breeding facility near Miami and an unknown number of additional animals entered the wetlands in a single night.

[00:03:25]In the warm foodrich environment of South Florida with no natural predators, they did what their biology was built to do. A single female produces up to 100 eggs per clutch. The population went vertical. Conservative estimates today place the number between 100,000 and 300,000 animals across South Florida. A landmark study was documented what that population did to the native food web.

[00:03:51]Raccoon populations in the hardest hit zones crashed by 99%.

[00:03:57]Apossums by 98%, bobcats by 87%.

[00:04:02]Marsh rabbits and foxes in specific survey areas were not reduced. They were functionally erased. Biologists describe driving for miles through habitat that had once been visibly alive and finding nothing, no movement, no animals crossing the road, just empty, silent wilderness where a thriving ecosystem had existed within living memory.

[00:04:26]Florida responded with everything available. The python elimination program launched in 2017 paid professional hunters working year round.

[00:04:37]Competitive removal events with cash prizes. Tens of thousands of animals removed since the program began. And the population absorbed every removal event within a single reproductive cycle.

[00:04:50]Thermal drones failed because pythons are coldblooded and the Everglades is already warm. Mechanical lures failed because ambush predators do not chase moving targets. The math of python biology defeated every approach before it could gain meaningful traction. Then the pythons started getting harder to find. Researchers at the Conservancy of Southwest Florida documented across multiple consecutive field seasons that traps generating consistent catches in one period stopped producing in the next. Hunters returning to productive sites found nothing. Not because the snakes had been removed, because they had moved deeper into nearly impassible terrain away from elevated levies where human activity concentrated.

[00:05:42]The shift was directional and consistent. Whether individual animals were learning to avoid human presence or whether natural selection was quietly removing the incautious ones and leaving only the wary to reproduce.

[00:05:58]Either explanation pointed toward the same conclusion. An apex predator already almost impossible to locate was becoming better at disappearing without anyone teaching it to. And while all of that was developing above ground, something else was moving through the Everglades completely undetected.

[00:06:18]Something microscopic, something that had arrived with the pythons and been spreading quietly for years.

[00:06:26]Dr. Christina Romagosa is a research scientist at the University of Florida.

[00:06:31]She was conducting routine health assessments on native Florida snake species when she encountered something that stopped her mid- examination.

[00:06:40]The animals were native species, garder snakes, pygmy rattlesnakes, common animals that should have been healthy.

[00:06:48]They were emaciated and weak, moving with the slow labored deliberateness of animals struggling to draw a full breath. When she examined them internally, she found the source. The lungs were packed with parasitic worms.

[00:07:05]Dozens of them burrowed into tissue blocking airways feeding on blood. She stepped back from the examination table before she could continue. Because what she was looking at was not an isolated case. It was a systemic biological invasion spreading through Florida's native snake populations for years without detection. The parasite is a lungworm native to Southeast Asia.

[00:07:33]Burmese pythons carry it. They have coexisted with it across thousands of years of evolutionary history and develop sufficient tolerance to remain functional hosts. Florida's native snakes have no such history, and the transmission pathway it uses is one of the most unsettling documented in modern wildlife biology. An infected python deposits waste in swamp water.

[00:07:59]Cockroaches consume that waste and pick up the laral parasites. Frogs eat the cockroaches. A native snake eats the frog. Inside the snake, the larve tunnel through the stomach wall and migrate directly to the lungs. They attach, feed, and multiply. As the infection accumulates, the airways fill. The snake weakens, stops eating, and eventually suffocates.

[00:08:24]Researchers have documented infected animals in the final stages with worms visible at the edges of their mouths.

[00:08:31]Dr. Romagosa's team mapped the spread and found the parasite had already moved beyond the Everglades. At least 18 different native snake species across Florida were infected. The lungworm had been documented as far north as Jacksonville. And the most significant finding was this. The parasite no longer requires the python to sustain its transmission cycle. It is now moving directly between native snake populations on its own. Even if every Burmese python in Florida disappeared overnight, the lungworm would remain permanently established, self- sustaining.

[00:09:08]Two simultaneous collapses accelerating each other. Pythons removing mammals from above. lungworm dismantling the reptile populations holding the middle of the food chain together. But inside that same research effort, something appeared that nobody expected. One species kept coming back clean. Across multiple survey sites and field seasons, the Florida cotton mouth, a venomous pit viper present throughout the same infected habitat as every affected species, showed zero signs of lungworm infection.

[00:09:44]No worms, no respiratory distress, nothing. Something in the cottonmouth's biology was creating an environment the parasite could not establish in. Whether immune response, blood chemistry, or the specific composition of its venom, the mechanism was unknown, but the implication was enormous. One native Florida snake had cracked a biological code that 18 others could not.

[00:10:12]Scientists filed it as the most urgent unanswered question in Florida wildlife biology. And while they were still working toward that answer, something was happening in North Florida that most people following the Everglades story had never heard about. The eastern indigo snake is the longest native snake species in North America. An adult reaches 9 ft. Its scales carry an iridescent blue black coloration that shifts in sunlight like polished metal.

[00:10:45]Its biology matters directly to the python problem. The eastern indigo is aophagus.

[00:10:52]It hunts and consumes other snakes. It does not constrict. It pins prey with powerful jaws and swallows it alive. It carries complete immunity to the venom of every pit viper native to North America. Rattlesnakes, cotton mouths, copperheads. The indigo eats them all without consequence. Nothing on the Florida forest floor evolved to stop it.

[00:11:18]Then development stopped it instead. The eastern indigo depends on gopher tortoise burrows for thermal regulation.

[00:11:26]As development consumed the longleaf pine forests of North Florida across the middle decades of the 20th century, gopher tortoise populations collapsed.

[00:11:36]The indigo disappeared with them. By the late 1970s, it was functionally gone from North Florida, absent from the ecosystem it had organized for millions of years. For decades, a quiet conservation effort worked to reverse that disappearance. captive breeding, longleaf pine forest restoration, gopher tortoise reintroductions to prepared sites, the slow, patient construction of the ecological infrastructure the indigo would need before any reintroduction could hold. Then in late 2023, a trail camera at a preserve in North Florida captured footage that made the research team stop everything. Dr. Kevin, herpatologist with the Florida Fish and Wildlife Conservation Commission, was among the first to see it. He had spent years releasing animals and watching some survive and others vanish. On the screen were two small eastern indigo hatchlings moving through the underbrush. Notre animals, wildorn.

[00:12:41]the first eastern indigo snakes produced in the wild in North Florida in approximately 50 years. He watched the footage twice. Then he picked up his phone. His hands, by his own account, were not completely steady. The king was back, reproducing on its own terms and native habitat for the first time in half a century.

[00:13:06]Trail camera data from the preserve and surrounding corridors began showing the wildorn population expanding its range southward, slowly, consistently moving in the direction of the python's established range. Two populations on a collision course nobody planned. An eastern indigo snake that has never encountered a Burmese python moving toward pythons that have never encountered an eastern indigo. The Indigo's hunting strategy does not rely on size. It relies on speed, jaw strength, and an absolute refusal to release its grip. It has taken down animals significantly larger than itself. It has never faced anything like a full-grown python. Nobody has documented that encounter. Nobody knows how it ends. But here is where the story turns dark in a way that cuts through any optimism about the indigo's return.

[00:14:04]The lungworm is spreading north. If the eastern indigo expands its range southward into infected territory, before anyone identifies what makes the cottonmouth resistant, and before any protective measure can be developed, it walks directly into the same biological trap that has already compromised 18 native snake species. The parasite that arrived with the pythons and has been spreading through Florida's wetlands for years does not distinguish between the species it destroys.

[00:14:36]50 years of conservation work, dozens of researchers, millions of dollars in habitat restoration and captive breeding. The first wildorn hatchlings in half a century. All of it advancing southward toward a microscopic organism that has no interest in which species was supposed to save the ecosystem. The biologist who found the headless python in the sawrass went back to that site 3 weeks later. She found two more carcasses in the following week. Same pattern, same precision, same absence of struggle evidence. Something in that section of swamp had identified a vulnerability in the most dominant invasive predator in North American history and was exploiting it with a consistency that no camera had documented and no researcher had predicted. The Everglades is not winning. The pythons are still present in numbers that no combination of human removal and natural pressure can address quickly. The lungworm is still spreading. The indigo is still years away from numbers that could matter at the population level. None of the questions that matter most have answers yet. But the story is no longer moving in only one direction. Bobcats learning to read python vulnerabilities.

[00:16:00]A microscopic parasite turning the invasion's own biology against it. A 50-year conservation effort producing wildorn animals moving toward a confrontation no one has witnessed. A single venomous snake apparently immune to a plague, working through everything around it. The swamp is not surrendering. It is fighting back on fronts nobody engineered and nobody predicted. And what happens at the collision point between the returning king and the python that has owned this landscape for four decades is a question the cameras in the saw grass are still waiting to answer. Who do you think survives that encounter? Drop your answer in the comments below. And if this story changed the way you think about what is already unfolding inside the Florida Everglades right now, subscribe to Terafactor. We will see you in the next