For two decades, the Burmese python faced no natural predators in the Florida Everglades. Neither alligators, nor hunters, nor the millions of dollars spent on eradication programs were able to stop the spread of the invasive species. In large areas of the wetlands, the snakes eliminated about 90 percent of small and medium-sized mammals before any native species began to mount an effective response.

The Burmese python can weigh nearly 90 kilograms and reach more than six meters in length. Its spotted skin provides effective camouflage in the marsh, and heat-sensitive pits along its jaws allow it to detect prey in complete darkness. A single female can produce up to 100 eggs per clutch. In Southeast Asia, tigers, leopards, and other apex predators keep python numbers in check. In Florida, no native species had evolved to recognize or fight a constricting ambush predator of this size.

The origins of the crisis trace back to the exotic pet trade. During the 1980s, demand for Burmese pythons grew rapidly in South Florida. Sellers told buyers the snakes would stay small and eat little. In practice, the animals grew quickly and required increasingly large meals. Many owners released unwanted pythons at the edge of the Everglades rather than keeping them.

In 1992, Hurricane Andrew destroyed several python breeding facilities along roads in South Florida, releasing a large number of adult snakes into the wild in a single event. Combined with continued releases of unwanted pets, the escaped population multiplied over the following years and is now estimated in the hundreds of thousands, ranging from Lake Okeechobee to the Largo area.

Researchers tracking one four-meter python with a satellite transmitter noticed that its signal had stopped. The next morning they found the snake dead in the mud with its head bitten off. Analysis of trail camera footage identified the attacker as a bobcat, a native North American cat weighing less than 15 kilograms.

The killing happened shortly after an unusual cold front had moved through South Florida. Pythons are cold-blooded animals, and their reflexes and muscle strength depend on outside temperatures. When temperatures drop sharply, the snakes become sluggish and nearly immobile for hours. A bobcat had taken advantage of that temporary vulnerability.

Further investigation found similar cases. A python tracked during another cold snap had been killed by a Florida black bear. Trail cameras in Big Cypress recorded a bobcat raiding an unprotected python nest. The Florida panther, one of the rarest big cats in the country, was documented killing adult pythons. Vultures were observed raiding exposed python nests. No native species could defeat a healthy adult python under normal conditions, but several species began exploiting the snake’s weaknesses at vulnerable moments.

The same cold snaps that gave native predators an opportunity also put pressure on the python population. Pythons that could not tolerate cold died. Those that survived had some degree of cold tolerance and passed those traits to their offspring. Over successive generations, the remaining population adapted to colder conditions faster than researchers expected. The cold events that once left pythons helpless gradually became less effective, reducing the advantage native predators had gained.

Efforts to control the python population have continued since the mid-2000s. Florida has employed professional python hunters who patrol levees and canals at night. Researchers have implanted radio transmitters in male pythons and released them back into the wild. During breeding season, the males lead scientists to larger females and hidden nesting sites.

The Florida Python Challenge, a public hunting event, drew around 1,000 participants from the United States and Canada in 2026, with prize money reaching $25,000. The event does not allow firearms or hunting dogs. The South Florida Water Management District, working with the University of Florida, deployed 120 robotic decoy rabbits designed to exploit the python’s heat-detection abilities. More than 23,000 pythons have been removed since 2000. A U.S. Geological Survey assessment concluded that a short public hunting event alone is not a realistic path to eradicating the species.

The python population is now understood as an ongoing presence in the Everglades rather than an invader that will simply disappear. Native species have begun to find and exploit the snake’s vulnerabilities, while the pythons themselves continue to adapt to conditions that once limited their spread. The long-term outcome remains unclear.