Burmese pythons invaded Florida’s Everglades in the 1980s; decades later, the decline in raccoon, opossum and bobcat population number is staggering

There is a wetland in the United States where raccoons have all but vanished. Where opossums are a rare sighting. Where rabbits, once everywhere, no longer show up on wildlife surveys at all. The cause isn't disease, or drought, or habitat loss in the usual sense. It's a snake, one that was never supposed to be there in the first place.

The Burmese python, native to the forests and grasslands of south-east Asia, has spent the last four decades turning Florida's Everglades into its own hunting ground. And the toll on native wildlife, backed by years of field data, is hard to overstate.

A Pet-Trade Escapee That Never Left

Nobody released Burmese pythons into the Everglades on purpose, at least not as policy. Most researchers trace the invasion back to the exotic pet trade of the 1970s and 80s. Owners who could no longer handle a snake that kept growing simply let it go. Some pythons slipped out during storms or other disturbances at breeding and holding facilities. Either way, by the mid-1980s, the species had found a foothold in the wild.


Also Read:Australian couple bought a cattle farm and planted 34,000 trees. Years later, koalas and wildlife are returning

And the Everglades, it turned out, was almost perfectly suited to them. Warm year-round temperatures, sprawling wetlands, dense cover, and no shortage of prey, conditions nothing like a glass tank back home, but ideal for a large constrictor looking to survive and breed.

Today, nobody can say with certainty how many pythons live in the park. Estimates run into the hundreds of thousands, though the snakes are so secretive that an accurate count may never be possible. That's the unsettling part: an animal that can stretch to 12 feet long is somehow easy to miss across the Everglades' vast, tangled terrain.

The Numbers That Tell The Real Story

The scale of what's happened only became clear through years of patient, unglamorous fieldwork. Between 2003 and 2011, scientists surveyed more than 35,000 miles of roads and tracks through Everglades National Park, logging every mammal they came across. It wasn't a headcount of the whole park's wildlife, rather, it let researchers compare sighting frequency across regions with different histories of python invasion.

Also Read: Alps Climber mystry solved: Bodies of two Belgian found in Swiss Alps, 34 years after they vanished

What they found was stark. Raccoon sightings, once one of the most common encounters in the park, had collapsed by 99.3%. Opossums were down 98.9%. Bobcats had fallen by 87.5%. Rabbits were harder to measure precisely, for a grim reason: surveyors simply stopped recording any in the worst-affected areas. A separate study tracking marsh rabbit deaths later confirmed python predation as a major factor.

These weren't small dips explainable by an odd survey year. They represented a fundamental reshuffling of who lives in the Everglades.

The Pattern That Convinced Scientists

What really pointed the finger at pythons wasn't just the decline itself, it was where the decline was worst. The steepest mammal losses showed up in the southern reaches of the park, exactly where pythons had been established the longest. Areas where the snakes arrived more recently hadn't seen anywhere near the same collapse. And regions outside the park with no recorded pythons still had healthy mammal populations.

That geographic overlap mattered. If some park-wide factor, a shift in climate, a change in habitat, had been behind the losses, there would be little reason for the damage to track so closely with python range. Instead, the decline moved with the snake.

Researchers were careful not to claim every missing raccoon or rabbit died in a python's coils; wildlife populations respond to many pressures at once. But the timing, the geography, and what's known about how pythons hunt all lined up in the same direction.

An Ambush Predator With No Fixed Menu

Part of what makes Burmese pythons so disruptive is that they aren't picky. They hunt mammals, birds and reptiles alike, striking from concealment rather than chasing prey down. A python catches its target with its mouth, constricts until it stops breathing, then swallows it whole, and can then go a long stretch without needing another meal.

That flexible diet has let the species hit multiple parts of the food web simultaneously, something a specialist predator couldn't do. Even threatened species haven't been spared, the endangered Key Largo woodrat has turned up as prey. And for many Everglades mammals, there's nowhere obvious to retreat to. The wetland is enormous, but size doesn't equal safety when a predator can lie in wait in the water, the marsh grass, or along a canal edge.

Should People Be Worried?

Understandably, a 12-foot snake sounds like a threat to more than just wildlife. But the record here is reassuring on that front. At least nine deaths in the US have been linked to Burmese pythons since 1999, every one of them involving a captive, pet-owned snake. No wild-born python has ever been documented killing a person in the United States.

The real cost of this invasion isn't to people. It's to the raccoon that no longer turns up on a survey route, the rabbit that's disappeared from the record altogether, the opossum that's become genuinely hard to find. None of those losses make headlines the way an attack would. Added together across a landscape as vast as the Everglades, though, they amount to one of the most dramatic ecological shifts caused by an invasive species anywhere in the country.

Why Catching Them Isn't Simple

Florida has thrown a fair amount at the problem, organised python hunts, professional trapping contracts, public removal programmes. Individual captures do add up, and some hunters have pulled in snakes well over 15 feet long. But the Everglades is a dense, waterlogged, practically endless landscape, and pythons are built to disappear into it.

Also Read:A Florida couple bought a 45-acre swamp to save it from development; 15 years later, 275 wood storks were nesting there in a thriving wildlife haven

Removing a few thousand snakes doesn't dent a population capable of rapid, sustained breeding. And there's a cruel irony to the whole effort: the animals conservationists are trying to protect are, more often than not, far easier to lose track of than the predator hunting them.