Key Takeaways
- Four hipopotamuses brought to Colombia by drug lord Pablo Escobar in the 1980s escaped after his death and have multiplied to an estimated ≈ 200 individuals, with projections of > 1,000 by 2035.
- As an invasive species with no natural predators, they threaten native wildlife (manatees, capybaras, fish) and alter river ecosystems through grazing, trampling, and nutrient loading.
- Local communities experience both benefits (tourism, pride) and hardships (fishermen’s losses, safety fears) from the hippos’ presence.
- Previous non‑lethal management efforts—relocation, castration, and hazing—have been costly, logistically difficult, and only marginally effective at slowing population growth.
- In April 2024 the Colombian government approved a US$2 million plan to euthanize up to 80 hippos via lethal injection or gunshot, while continuing attempts to relocate the remainder.
- The culling proposal has sparked fierce debate: animal‑rights advocates oppose killing the animals, conservationists argue it is necessary to protect biodiversity, and many residents feel torn between affection for the hippos and concern for their livelihoods and safety.
When night falls over the Colombian town of Doradal, the usual calm is broken by the heavy, wet thuds of unofficial “pets” that roam parks, schoolyards and gardens. These are hippopotamuses—massive, semi‑aquatic mammals weighing up to 1,300 kg each—that have wandered far from their African origins and now inhabit the Magdalena River basin. Fishermen like Giovanny Contreras describe how the animals have altered their way of life, forcing them to avoid night‑time fishing for fear of encountering a lurking hippo whose submerged body can overturn a boat with a single head movement.
The story begins in the 1980s when Pablo Escobar, at the height of his cocaine empire, imported four hippos as exotic ornaments for his sprawling Hacienda Napoles estate. After Escobar’s death in 1993, the estate was abandoned and the hippos, left to fend for themselves, found the Colombian wetlands ideal for resting, grazing, and reproducing. Over three decades the herd has grown unchecked; scientists now estimate roughly 200 free‑ranging hippos, labeling them an invasive species. Models suggest the population could surpass 1,000 by 2035 if no decisive action is taken.
Ecologically, the hippos pose a serious risk. Without natural predators such as lions or crocodiles, they compete with native herbivores like manatees and capybaras for food and space. Their massive trampling can destabilize riverbanks, while their dung enriches waterways, potentially triggering algal blooms that diminish fish stocks—an direct threat to the livelihoods of local fishers. Experts warn that as the animals expand northward along the Magdalena’s 1,600‑km course, the likelihood of dangerous encounters with humans will rise; a 2020 attack that broke a farmer’s ribs and a 2023 vehicle‑hippo collision illustrate the growing peril.
Efforts to manage the population have been fragmented and costly. Early attempts involved relocating animals to zoos, but few facilities worldwide accepted the large, aggressive beasts. Veterinarians tried castration campaigns, a process that requires at least eight people to trap, sedate, and operate on each hippo and yields only modest reproductive suppression. In 2009 a state‑authorized hunt killed an especially aggressive male nicknamed Pepe; a leaked photo of smiling soldiers beside the carcass provoked national outrage, leading a judge to ban further lethal control and pushing authorities toward non‑lethal methods.
Biologist David Echeverri and his team experimented with luring hippos to pastures using vegetables, capturing a handful for zoos, and tranquilizing dozens for castration—efforts that consumed six to eight hours per animal and still failed to curb growth. A 2021 scientific review concluded that euthanasia is among the most effective tools for ecosystem protection, prompting the Colombian government to declare hippos an invasive species in 2022 and to green‑light a $2 million culling plan in April 2024. Under the proposal, up to 80 hippos would be killed via lethal injection or gunshot to the head, while continued attempts would be made to relocate the remainder.
The plan has ignited fierce debate. Animal‑rights groups condemn killing sentient beings that bear no blame for Escobar’s whims, while conservationists stress that, left unchecked, the hippos could displace endemic species and degrade the Magdalena’s ecology. In Doradal, where the hippo population has become a quirky tourist draw—complete with kitsch statues, guided tours, and even occasional illegal pet‑keeping of calves—residents express mixed feelings. Samy Castaño, whose home faces a hippo‑filled pond, acknowledges the personal conflict: “I know we must either remove them or move them, but they are innocent animals.” His 11‑year‑old daughter Luciana adds that she does not want the creatures killed, recalling a hippo that once peered through her living‑room window while she watched TV.
Tourism has turned the hippos into a source of local pride and income, yet fishermen like Contreras lament lost catches and the fear of navigating darkened waters where massive bodies lie just beneath the surface. The hippos’ presence also revives the uneasy legacy of Escobar, a figure Colombia is striving to move beyond. As authorities weigh the ethical, ecological, and socio‑economic dimensions, the decision will shape not only the future of these African giants in South America but also the communities that have learned to live alongside them.