In the warm lands of Colombia, in the heart of South America, where rivers wind between jungles and cattle, thrives a huge and fascinating creature that does not belong to the continent: the African hippopotamus.
In 2024, the Guinness World Records officially recognized this population as the largest invasive species on the planet, an ecological irony that places the second heaviest land animal in the world —after the elephant— in a territory that was never its own.
The origin: from Hacienda Nápoles to Colombian rivers
The story began in the 1980s, when drug lord Pablo Escobar brought four hippos from Africa —three females and one male— for his private zoo at Hacienda Nápoles in Colombia. After his death in 1993, the animals were left uncontrolled, escaped to nearby rivers, and began to reproduce freely.
What seemed like an exotic curiosity transformed into an unprecedented biological phenomenon. Today, according to studies by the Humboldt Institute and the National University of Colombia, it is estimated that there are between 150 and 200 hippos mainly distributed in the Magdalena and Cauca rivers.
A population without natural predators
In Africa, hippos inhabit ecosystems regulated by natural predators and ecological dynamics that limit their expansion. In Colombia, however, they have no natural enemies, which has allowed uncontrolled growth.
It is estimated that the population, estimated at 168 individuals in 2023, could reach 400 by 2030 if no measures are taken.
Environmental impacts and social risks
The presence of hippos in Colombia generates multiple impacts:
- Invasion of ecosystems: they remove sediments, destroy vegetation, and alter water quality with their organic waste.
- Threat to native fauna: they compete for resources with species such as the capybara, the manatee, the otters, and the striped catfish, which are essential for local communities.
- Impact on the ecosystem: they modify the flora and fauna of the rivers, altering the natural balance.
- Accelerated growth: their rapid reproduction multiplies the environmental and ecological problem.
- Risks for communities: although they seem docile, hippos are territorial and aggressive. In Africa, they cause more human deaths than any other wild mammal, posing a real danger to those living near Colombian rivers.
The ethical and political dilemma
The debate on what to do with the hippos divides environmentalists, politicians, and local communities. The options include:
- Eradication: eliminate the population to protect biodiversity.
- Relocation: move them to zoos or controlled reserves.
- Sterilization: control their reproduction without sacrificing individuals.
Each alternative poses scientific, logistical, and ethical challenges. Meanwhile, the hippos continue their slow and silent march through Colombian rivers, becoming a symbol of a human-created imbalance.
An environmental and social problem of national scale
The case of the hippos in Colombia is unique in the world and reflects how an isolated decision can trigger a large-scale environmental problem. The largest invasive species on the planet threatens native biodiversity, endangers local communities, and poses an ethical dilemma on how to act against a population that should never have been there.
Pablo Escobar’s hippos are now a biological and social phenomenon without precedent in South America. Their presence in Colombia represents a threat to biodiversity and community safety, but also an ethical and political challenge on how to manage such a large invasive species.
The future of these animals will depend on the decisions made in the coming years: whether their population can be controlled or if they continue to expand, forever altering the region’s ecosystems.
