The lazy narrative is everywhere. You’ve seen it on every major news outlet from the BBC to CNN. They call them an "invasive menace." They call them a "biological time bomb." They scream about how Pablo Escobar’s "cocaine hippos" are destroying the Magdalena River. And now, the Colombian government is moving toward a culling program—a polite term for a massacre—to "protect the ecosystem."
It’s a massive, expensive, and scientifically shallow mistake.
Killing these animals isn't an act of environmental preservation. It’s an act of bureaucratic cowardice. We are witnessing the most significant unintended rewilding experiment of the 21st century, and instead of taking notes, we are loading rifles.
The Myth of the Pristine Ecosystem
The primary argument for the slaughter is that hippos "don't belong" in South America. This is based on the flawed assumption that an ecosystem is a static snapshot from 1491 that we must preserve in amber.
Here is the truth: The South American megafauna didn't just vanish because they weren't "supposed" to be there. They were hunted to extinction by humans or wiped out by climate shifts. Ten thousand years ago, the banks of the Magdalena were home to giant ground sloths and glyptodonts—massive armored mammals that filled similar ecological niches to the hippo.
When the hippos escaped Hacienda Nápoles, they didn't invade a fragile, balanced world. They filled a vacancy.
Research from the University of Technology Sydney has already highlighted that the hippos share traits with extinct South American species. By grazing on land and defecating in the water, they are cycling nutrients in a way the river hasn't seen in millennia. They are engineers, not invaders. The "native" argument is a social construct, not a biological one. If we only protected species that have been in their current location for millions of years, we’d have to strip half the biodiversity from the planet.
Follow the Money and the Blood
Culling is the easy way out for politicians who want to look "decisive."
I have watched government agencies throw millions at "management plans" that involve helicopters, heavy sedation, and high-powered rifles. Do you know what happens when you try to hunt a three-ton animal in a dense, tropical river system? You miss. You wound. You create a dangerous, aggressive population that learns to fear humans.
The logistics are a nightmare:
- The Weight: A single adult hippo weighs over 3,000 pounds. Transporting a carcass out of a remote marshland is a logistical absurdity.
- The Cost: Estimates for sterilization or relocation run into the tens of thousands per animal. Hunting is sold as "cheaper," but it ignores the long-term ecological and social cost.
- The Tourism Backlash: The Magdalena region has built an entire economy around these animals. The locals don't hate the hippos; they’ve named them. They sell t-shirts. They lead tours.
When the government starts shooting, they aren't just killing animals. They are killing a local economy that rose from the ashes of the drug wars. It’s a classic case of Bogotá-based elites making decisions for rural communities that actually have to live with the consequences.
The Water Quality Scaremongering
The "scientific" justification often centers on oxygen levels in the water. Critics claim hippo waste causes eutrophication—an excess of nutrients that leads to algae blooms and fish kills.
Let’s get real.
The Magdalena River is one of the most polluted waterways in South America. It is a dumping ground for industrial runoff, untreated sewage from dozens of municipalities, and mercury from illegal mining. To blame the water quality issues on 170 hippos is like blaming a forest fire on a guy lighting a cigarette.
The hippos are a convenient scapegoat. If the government can convince you that the river is dying because of Escobar's pets, they don't have to address the fact that they've failed to regulate the massive corporations dumping chemicals upstream for decades.
A New Framework: Functional Rewilding
Instead of sharpening the knives, we should be leaning into functional rewilding.
Hippos are "megagrazers." They keep grasslands open. They create pathways through thick vegetation that smaller species use. They move nutrients from the terrestrial environment into the aquatic one. In Africa, this is considered a vital part of the Great Rift Valley’s health. In Colombia, it’s labeled a "plague."
We should be asking different questions:
- How do the fish populations respond to increased nutrient loads in stagnant pools? Some studies suggest certain native species might actually thrive.
- Can we use the hippos as a flagship species for broader conservation? Use the hippo-driven tourism revenue to protect the manatees and jaguars that the world actually ignores.
- What is the real carrying capacity? Stop quoting "exponential growth" models that assume the hippos will eventually cover the entire continent. They won't. They are restricted by water availability and temperature.
The Brutal Reality of Sterilization
People love to suggest "humane" sterilization as the middle ground.
I’ve talked to veterinarians who have attempted this. It is one of the most dangerous procedures in modern zoology. A hippo’s skin is incredibly thick. They don't respond well to anesthesia. Their heart rates are notoriously difficult to monitor. You are essentially performing major surgery in a muddy swamp on an animal that can bite a crocodile in half.
The mortality rate for the animals during these procedures is high. It’s not "humane"; it’s just killing them with a more expensive, clinical flair.
The Tourism Pivot
If the Colombian government had any vision, they would stop treating the hippos as a liability and start treating them as a global research hub.
The world is obsessed with the concept of "Pleistocene Rewilding"—the idea of bringing back proxies for extinct megafauna to restore ecosystems. We have a live, unplanned trial happening right now in the department of Antioquia. Scientists from around the globe should be flocking there to study the impact of large herbivores on neotropical landscapes.
Instead, we’re inviting hunters.
Stop Asking if They Belong
The question "Do hippos belong in Colombia?" is the wrong question. They are there. They have been there for forty years. They are breeding, they are healthy, and they have integrated into the local culture and geography.
The right question is: "Why are we so obsessed with destroying a biological success story because it doesn't fit our narrow definition of 'natural'?"
Nature is adaptive. Nature is messy. Nature doesn't care about your 500-year-old maps. The hippos have moved on from the legacy of Pablo Escobar. It’s time for the Colombian government and the international scientific community to do the same.
The hippos are not a ghost of the past. They are a new, strange future.
Put the guns away and pick up the binoculars.
