Florida wildlife officials have considered a large-scale method to reduce Burmese python numbers in the Everglades: dropping dead mice laced with acetaminophen from helicopters. The common painkiller is highly toxic to snakes, which lack the enzyme pathway mammals use to process it. Laboratory tests confirm it is effective against Burmese pythons.

The proposal has not moved forward. One significant obstacle is the risk to the Florida panther, a species with an estimated population of between 120 and 230 adults. Acetaminophen is also highly toxic to cats, and the panther’s range overlaps with python habitat.

A second concern involves the Eastern indigo snake, a native species that is a natural predator of young pythons. Its population has already been reduced by habitat loss. The effect of acetaminophen on indigo snakes has not been tested, but the species feeds on mice and would likely encounter the baits.

The method was developed after similar baiting proved effective on Guam, where brown tree snakes devastated native bird populations. In that case, the island’s ecosystem had already lost most of its ground-nesting bird species, reducing the risk of collateral damage. The Everglades, by contrast, still contains a wide variety of wildlife, including many species that could consume the baits or scavenge animals that had.

The python problem itself is well documented. The snakes, introduced through the exotic pet trade, have no natural predators in Florida once they reach a certain size. They consume a broad range of prey, and studies have documented sharp declines in populations of raccoons, opossums, and marsh rabbits in areas where pythons are established. Survey work has recorded sections of marsh with no mammal activity at all.

Because adult pythons are difficult to locate, hunting and removal programs have not kept pace with the breeding rate. A single female can lay up to 100 eggs per season, and an experienced hunter may search for hours before finding a single snake. Tracking programs using transmitter-equipped male pythons, known as Judas snakes, have helped locate breeding females, but the method is labor-intensive and limited in geographic reach.

The bait proposal would target juvenile pythons, which eat mice and climb through low branches where the baits are designed to land. If enough juveniles were removed consistently over several seasons, population modeling suggests recruitment would fail and the python population would decline over roughly a decade.

The concern is that a bait drop cannot control which animal consumes the bait. Fish, water snakes, cottonmouths, birds, and other species could take it directly or ingest it by scavenging poisoned prey. Acetaminophen breaks down in the environment rather than accumulating in tissue, but the full ecological effect of a large-scale drop remains unclear.

The proposal also raises questions about the broader record of large-scale biological interventions. In Australia, baiting programs aimed at foxes and feral cats initially produced strong results, but some target populations later developed tolerance to the compound used. The experience suggests that such programs rarely produce only the intended outcome.

Public reaction has also played a role. A 2020s initiative to release genetically modified mosquitoes in Florida faced significant public opposition despite scientific support. Officials have been reluctant to pursue a plan involving millions of medicated baits dropped over a protected wetland for similar reasons.

The decision remains unresolved. In the meantime, python management continues through hunting, detection dogs, and tracking programs. The snakes continue to expand beyond the Everglades into areas where they have not previously been established.