Mozambique RELEASES AFRICA'S MOST DANGEROUS ANIMAL - After 2 Months, The Results Shock Scientists

Added: 2026-06-01

[00:00:00]Reintroducing Africa's most dangerous predator to save a forest sounds like a very risky idea, but this is how Mozambique managed to grow from 10,000 wild animals to 100,000 while also adding 3 million trees in just a few years. This is one of the most successful ecological restoration projects in Mozambique, but the key person behind this idea was not an ecologist or a scientist. It was an American philanthropist. Let's begin and see how this nearly 5-year journey unfolded. Gorongosa was once called Mozambique's most famous safari destination, a true Africa's Eden, but the Mozambican Civil War from 1977 to 1992 left this place almost empty.

[00:00:43]According to educational materials from HHMI BioInteractive, before the war, Gorongosa [music] had more than 200 lions, 2,500 elephants, 14,000 buffalo, 6,500 wildebeest, >> [music] >> and 3,500 zebras. After the war, many of these populations collapsed. The BBVA Foundation also reported that a 1994 [music] census showed that 99% of the park's large mammals had disappeared. Animals were killed to feed soldiers. Local people, desperate for meat, also came here to hunt them. Elephants were poached for ivory, which was traded for weapons, >> [music] >> and wire snares were scattered across the landscape. A few decades after the war, the populations began to rise again. Bushbuck started appearing in open flood plains, places they would normally avoid. Waterbuck exploded to around 65,000 individuals. Baboons began sleeping on the ground and becoming more active at night. At first, this may sound positive, but in reality, it was a sign that the ecosystem was recovering in an unbalanced way. Herbivores were bouncing back much faster than predators. The first person who truly saw Gorongosa's biggest problem was not the government, nor was it a famous conservation organization. It was Greg Carr, an American technology entrepreneur and philanthropist. At first, [music] he came to Mozambique mainly for humanitarian work and post-war development support, but when he saw Gorongosa with his own eyes, he realized that something was still there, yet the balance of this place had almost completely collapsed. Greg Carr was not an ecologist. He had succeeded in the telecommunications and internet industries in the United States. After leaving the business world, instead of building another new company, he chose to help restore one of Africa's most devastated post-war landscapes.

[00:02:36]According to many reports about the Gorongosa project starting in 2008, the Greg Carr Foundation began a long-term partnership with the government of Mozambique with an investment commitment often cited at more than $100 million over several decades. He did not simply pour money into the park and leave. Greg Carr also rebuilt anti-poaching teams, trained rangers, expanded schools and health care, and created jobs for communities around the park. He understood that if local people remained poor, hunting would never truly end.

[00:03:08]>> [music] >> The project also restored the forests of Mount Gorongosa by planting 3 million trees, helping protect the water supply for the entire floodplain below. But our main problem was still there. Herbivores were recovering much faster than predators. [music] By 2018, herbivore biomass had increased by 95% almost returning to pre-war levels, while predators had recovered to less than 10%. The ecosystem was beginning to fall out of balance. That was when Gorongosa decided to bring African wild dogs, known locally as mabecos, back to the park. The first reintroduction finally began in 2018. Gorongosa selected 15 African wild dogs from South Africa, including nine adult males and six adult females. These were some of the healthiest individuals >> [music] >> and most importantly, they had the right social structure to form a stable, long-term pack. On the 29th of March, 2018, they were sedated, given health checks, and placed into specialized crates before flying more than 620 miles from South Africa to Mozambique. The flight lasted about 3.5 hours. That may sound short, but for African wild dogs, it was an extremely sensitive period.

[00:04:21]This species becomes stressed very quickly.

[00:04:25]Just a few panicked individuals could be enough to collapse the pack's hierarchy before they were even released. When they arrived in Gorongosa, one adult male died from complications related to transport and sedation. The first pack dropped from 15 to 14 individuals before the project had even truly begun.

[00:04:43]Instead of releasing them directly into the wild, Gorongosa kept the pack inside a boma of about 54,000 square feet for 8 weeks, allowing the hierarchy to stabilize and reducing their stress. On the 15th of June, 2018, the first Mabeco pack officially returned to Gorongosa after decades of absence. At first, everything looked very positive.

[00:05:06]The alpha female, Beira, was already pregnant before the release, but then the harsh reality appeared very quickly.

[00:05:14]According to a study published in Plos One and data from Gorongosa National Park, the first litter in 2018 was abandoned after the pack entered a breeding den, most likely because of African rock pythons around the denning site. The entire first litter failed, but Gorongosa did not stop. Scientists began adjusting how they selected denning habitats, monitoring predator pressure, and better understanding how wild dogs reacted to their new environment. Those early failures became the foundation for the second phase of reintroduction that followed. In late 2018, the second reintroduction was carried out with a new pack named Piwazi. Once again, they selected exactly 15 adult individuals, including nine males and six females. This time, >> [music] >> the dogs came from Khumaga Kalahari Game Reserve in South Africa, a semi-desert region known for African wild dog packs with strong hunting experience because they had to survive in a much harsher environment. The transport distance this time was even longer than the first one, about 800 miles, with a flight lasting nearly 4.5 [music] hours. Yes, the risks of stress, dehydration, body temperature problems, and anesthesia-related complications were all higher.

[00:06:27]The health checks, sedation process, crate cooling system, and heart rate monitoring were much stricter this time, and this time no individual died during transport. After arriving in Gorongosa, the Piwazi pack was also kept inside a boma before being released into the wild, but this time things began to change clearly. The packs no longer behaved like rescued animals. They began expanding their own territories, hunting on their own, and reproducing naturally.

[00:06:55]A beta female named Namagaya even successfully gave birth to a litter of eight pups, and the whole pack accepted and raised them.

[00:07:04]That is something not every wild dog pack does because in many places only the alpha pair usually breeds. According to a study published in PLoS One from June 2018 to September 2020, scientists identified a total of 111 individuals in Gorongosa, including 29 founding animals and 82 individuals born inside the park. In just a little over 2 years, the population grew from almost zero to a peak of around 102 individuals in June 2020. The survival rate of the founding group reached about 86%, an extremely high number for African wild dogs, which many ecologists consider one of the hardest predators to restore in Africa.

[00:07:46]During the first 28 months after reintroduction, the wild dog packs expanded their territory very quickly.

[00:07:52]In the first half of the study period, the M'becos used about 193 square miles, >> [music] >> equal to 13% of Gorongosa's area. In the second half, that range increased by 117%.

[00:08:05]This was very important because it showed that the population had not yet reached its ecological limit. About 68% of the park was still unused by them, meaning the wild dog packs still had room to keep expanding. The PLOS ONE study called this the first successful reintroduction of African wild dogs into a large unfenced landscape in Mozambique. Along with this expansion in scale, their effects on the ecosystem became increasingly clear. When predators were gone, many herbivores began living as if they had almost forgotten danger. They spent more time feeding in open floodplains, moved less, and could keep eating young plants in the same area over and over again. But wait, >> [music] >> do not misunderstand this as wild dogs wiping out these herbivores. The people leading the project would never allow that to happen. The goal was not to reduce any species too much. They only needed to prevent herbivores from exploding in number and turning into a disaster. They needed these wild dogs to return because their presence changes the behavior of the entire ecosystem.

[00:09:10]Just the regular presence of a wild dog pack can make bushbuck, kudu, nyala, and waterbuck more alert. These animals spend less time feeding in open areas and change their movement routes. As a result, grazing pressure becomes more widely spread out. Some young trees and fresh shoots get a better chance to survive longer. More diverse vegetation can create more shelter for insects, birds, reptiles, and small animals. The important thing is that scientists are very careful when talking about this.

[00:09:41]They do not claim that wild dogs have restored the entire forest. To track this, Gorongosa uses GPS collars, camera traps, ranger patrols, and movement ecology data to see whether prey animals change where they feed, adjust how much time they spend in open areas, or become more vigilant when predators return.

[00:10:00]Princeton has called this a watershed experiment. Gorongosa is beginning to re- vive a multi-layered predator structure. A healthy ecosystem cannot have only lions. Lions control large prey and create strong zones of danger.

[00:10:14]Wild dogs create moving pressure on medium-sized antelopes. Leopards control species that live near thick cover.

[00:10:20]Hyenas both hunt and recycle carcasses.

[00:10:23]Even prey remains left behind by wild dogs become food for vultures, jackals, insects, [music] and microorganisms, helping energy return to the soil more quickly. From a park that had fewer than 10,000 large animals after the war, Gorongosa has now recovered to more than 100,000 wild animals. Looking at the speed of Gorongosa's recovery, many people are excited about this positive comeback. But honestly, the reality is much more complicated. Even when wild dogs reproduce well, risks still exist everywhere. The biggest threat is still wire snares and bushmeat hunting. So far, the PLOS ONE study has not recorded any African wild dogs in Gorongosa dying directly because of humans. But that could change at any time. Mabeços move across extremely large areas. A pack can run dozens of miles in a single day and move beyond protected patrol zones.

[00:11:16]Just one wire snare set for a bushbuck or a warthog could accidentally kill a rare predator.

[00:11:22]That is not just a theory.

[00:11:25]A 2025 study on lions in Mozambique recorded 326 incidents involving 426 lions killed by human-related causes between 2010 and 2023.

[00:11:39]More than half of those cases were linked to bushmeat bycatch and poaching.

[00:11:43]This shows that large carnivores in Mozambique are still living in a very risky environment. Disease is another equally frightening problem.

[00:11:51]>> [music] >> African wild dogs live in extremely close social groups. They lick each other's faces, eat together, and raise pups together. That is why viruses such as rabies, canine distemper, and parvovirus can spread through a pack almost like a domino effect.

[00:12:07]The more they expand toward the edges of the park, the higher the risk of contact with domestic dogs becomes. Then, in March 2019, Cyclone Idai hit Mozambique and flooded many parts of Gorongosa. A study published in nature showed that in just 1 week, the area flooded deeper than 20 in increased nearly fivefold from about 9 square miles to almost 46 square miles. Some areas were flooded to nearly 20 ft deep. Events like this make all predator-prey data much more complicated. Do you remember how we talked earlier about Gorongosa beginning to revive a multi-layered predator structure?

[00:12:46]In fact, those animals are also among the other species that have been reintroduced here. Lions are the clearest example. After the Mozambican Civil War, Gorongosa was left with only a few scattered lion groups struggling to survive because of a lack of prey, wire snares, and bushmeat hunting. But according to Wired, during the recent recovery period, the park recorded at least 146 lions. To reach that point, starting in 2013, the team led by ecologist Paula Bouley had to fight almost every day against wire snares.

[00:13:21]These snares were originally set to catch bushbuck or warthogs, but they often tightened around the legs and necks of predators. The lions here are continuously fitted with GPS collars.

[00:13:32]HHMI BioInteractive explains that if a lion signal stays in one place for more than 24 hours, the veterinary unit immediately checks on it because that often means the animal is injured, trapped, or dead. WildCam Gorongosa once recorded a male lion named Jatu being sedated by helicopter so a snare could be removed from his body. Then there are Gorongosa's leopards.

[00:13:58]After nearly 14 years of almost disappearing, a camera trap in March 2018 recorded a leopard in the southern part of the park for the first time. In 2020, [music] Gorongosa carried out its first official leopard translocation after 3 years of preparation. By 2025, a total of six leopards had been reintroduced. What matters most is how they hunt. If wild dogs create pressure through long-distance pursuit, leopards create a completely different kind of fear.

[00:14:27]Silent ambushes from thick cover at night. Spotted hyenas also returned in 2022. [music] By 2024, Gorongosa confirmed that a total of 15 hyenas had been reintroduced, [music] and hyena cubs had already been born naturally.

[00:14:42]This is a major milestone because hyenas do not just eat carcasses as many people think. They are both predators and an ecological recycling crew, helping return nutrients to the soil more quickly through the remains of dead animals. Perhaps the most haunting example from Gorongosa comes from elephants. Before the war, this area had about 2,200 elephants.

[00:15:05]After the civil war, more than 90% of them disappeared. But the frightening part is that the war did not just kill elephants. It also changed the direction of their evolution.

[00:15:16]A 2021 study published in Science showed that the percentage of tuskless female elephants increased from about 18.5% before the war to more than 50% after the war because elephants with tusks were hunted more heavily for ivory.

[00:15:33]Princeton even reported that tuskless female elephants were about five times more likely to survive during the period of intense ivory poaching. As the animals returned, more and more people began coming back, too. But this time, they were not hunters or soldiers. They were tourists, researchers, and people willing to pay to see a real ecosystem coming back to life. But wait, do not misunderstand this. The park still fully belongs to the government. In its 2023 report, >> [music] >> Gorongosa described ecotourism as an economic multiplier. That money spreads to lodges, guides, rangers, cooks, drivers, maintenance workers, farmers who supply food, and communities around the park. Before the war, Gorongosa was once one of the most famous safari destinations in Africa. According to the park's historical records, in the late 1960s, Chitengo Camp served about 300 to 400 meals a day to tourists. Back then, the area had a swimming pool, a restaurant, a gas station, and hundreds of regular visitors. Then the war came.

[00:16:37]The park closed for many years and almost disappeared from Africa's tourism map. Today, tourism is returning along with the wildlife. In 2023, Gorongosa [music] expanded its lodge facilities and increased guest capacity for the new safari season. That same year, Mozambique recorded more than 1.15 million international visitors. The park has also trained more tour guides and developed experiences such as walking safaris, bird watching, canoe safaris, and ecological research tours. Most importantly, local people are beginning to see that living animals have greater economic value than dead ones.

[00:17:15]A pack of wild dogs or a pride of lions can bring tourists for many years, but an animal hunted for bushmeat only brings a very short-term benefit. That is a huge shift in mindset. In the end, Gorongosa is still not fully balanced.

[00:17:30]Predators are still recovering, climate disasters still happen, and humans remain the biggest variable. But after decades of war and collapse, this place has proven something extraordinary. With enough time, science, and determination, an entire ecosystem can come back from almost nothing. Do you think Gorongosa could become the most successful rewilding model in the world? Leave a comment below and subscribe to the channel to discover more incredible nature restoration projects.