Florida has spent years trying to control its population of Burmese pythons, an invasive species that has caused significant damage to the Everglades ecosystem. One proposed solution, the aerial distribution of acetaminophen-laced bait, has proven effective on the island of Guam against another invasive snake species. However, the same method carries serious risks for Florida’s native wildlife, including the endangered Florida panther, making it unlikely to be adopted there.
Since 2017, government agencies, contractors, and licensed hunters have removed more than 10,000 Burmese pythons from the Florida wilderness. The state sponsors an annual Python Challenge that sends hundreds of people into the swamps, with each event typically yielding between one and 200 snakes. Professional trappers work along levees year-round, while amateur hunters patrol canal banks at night with headlamps, catching snakes by hand. It is difficult, exhausting work that often ends with empty hands and wet boots.
Despite these efforts, the program has not kept pace with the python population. It takes, on average, about twelve hours of combined effort to catch a single snake. No one knows exactly how many pythons live in the Everglades, with estimates ranging from tens of thousands to higher numbers that wildlife officials are reluctant to state publicly. All models agree that the snakes are reproducing faster than removal efforts can stop them.
Female pythons can lay dozens of eggs per nest, sometimes up to one hundred. Adult snakes are nearly invisible among the sawgrass, staying still for days while digesting a meal, then submerging in water that hides them completely. They are believed to have arrived through the exotic pet trade, released when small, appealing animals grew into large predators. Researchers have found adult pythons that consumed full-sized deer, including hooves and antlers. In parts of the Everglades, populations of raccoons and opossums have dropped by roughly 90 percent. Rabbits, marsh birds, and other species have declined under the same pressure. A study tracking marsh rabbits with radio transmitters confirmed that pythons were responsible for most deaths in the study area.
The Guam precedent is instructive. A brown tree snake, about a meter long and mildly venomous, arrived on the island in military cargo after World War II. Guam’s native birds had evolved without ground predators and had no defense against the snake. By the time researcher Julie Savidge published her findings in the late 1980s, dozens of native bird species had stopped breeding on the island, with most populations down by more than 90 percent. The loss of birds also disrupted seed dispersal and insect control, and the snakes caused frequent power outages by climbing electrical equipment.
In response, wildlife scientists developed a control method using acetaminophen, the active ingredient in Tylenol. An 80-milligram dose, about a quarter of a child’s dose, is lethal to brown tree snakes because their livers cannot process it. The bait is placed inside dead mice, attached to small cardboard fins with paper streamers so they catch on high branches, and dropped from helicopters. The method was approved for use in Guam in 2003 and has reduced snake numbers in treated areas. The strategy works because brown tree snakes scavenge dead prey, and the small dose is unlikely to harm larger animals.
Burmese pythons appear to share the same metabolic vulnerability to acetaminophen. However, applying the same method in Florida faces significant obstacles. The bait is designed for young pythons, which climb trees and hunt small rodents. Adult pythons, which can reach 16 feet and 165 pounds and feed on deer, are not interested in mice. The strategy would need to be deployed on a massive scale, with millions of bait drops repeated several times a year for years, to interrupt the breeding cycle.
The Everglades is one of the most biologically diverse wetlands in North America, home to hundreds of bird species, dozens of reptiles and mammals, and many fish. Unlike Guam, where the ecosystem was already largely depleted when bait drops began, the Everglades still supports a complex food web. Acetaminophen does not distinguish between target and non-target species. Raccoons and opossums, already stressed by python predation, would likely consume the dead mice. Birds of prey, including owls, hawks, and eagles, could eat poisoned rodents or scavengers and suffer secondary poisoning. The compound could move silently through the food chain over days or weeks, with damage appearing far from the drop sites.
The most serious risk involves the Florida panther. Only an estimated 120 to a few hundred remain in the wild, confined to the southwestern corner of Florida. Acetaminophen is highly toxic to cats, including panthers, because their livers lack the enzyme needed to process it safely. Even small doses can cause liver failure. Panthers are opportunistic predators and might eat dead mice found in low vegetation. Losing even two or three panthers to a baiting campaign could be devastating for a population that has no margin for error. The population dropped to a few dozen in the mid-1990s due to inbreeding and related health problems, and the current numbers are the result of three decades of intensive conservation work. The ranges of panthers and pythons overlap across much of south Florida.
Another native species at risk is the eastern indigo snake, the longest native snake in North America. It is one of the few animals that actively hunts and eats young Burmese pythons, making it a natural ally in controlling the invasive population. Its numbers have declined for decades due to habitat loss, and government programs are currently breeding it in captivity for release. Eastern indigo snakes also eat mice, so they would likely encounter the bait, and their sensitivity to acetaminophen has not been tested.
There are also practical limitations. Aerial bait drops are not precise. Many mice would land in water, where pythons are often found, but where fish and other aquatic animals would consume them. Venomous snakes, including rattlesnakes and cottonmouths, and native water snakes would also encounter the bait. On the scale required, the program would amount to years of chemical application across a wetland that is already under stress.
Public opposition is another barrier. In the early 2020s, Florida Keys residents strongly opposed the release of genetically modified mosquitoes, despite the scientific basis for the program. Public meetings became contentious, lawsuits followed, and the project faced intense scrutiny. The announcement of millions of dead, drug-laced mice dropped from helicopters over the Everglades, where they might be eaten by raccoons, panthers, eagles, indigo snakes, or family pets, would likely generate even stronger resistance.
Current removal efforts continue. Trained dogs can detect pythons by scent, and researchers have developed a technique using captured female pythons fitted with transmitters. During mating season, males approach the female, and hunters follow the signal to find and remove multiple snakes at once. These methods are slow, labor-intensive, and do not match the scale of the problem, but they remain the available options.
No tool currently exists that can match the simplicity of aerial bait drops, but none can be deployed in the Everglades without unacceptable collateral damage to species that cannot withstand the loss. The conflict is built into the environment itself. The same biodiversity that makes the Everglades valuable also makes broad chemical control impossible. The python population continues to grow, and the state continues to search for a solution that works within those constraints.
