Since Guam has no indigenous snakes, this invader from Australia had zero competition for groceries. As a result, the brown tree snake has spent the last half century severely depleting several of Guam's native species. It wasn't long before the USDA and EPA reached the same conclusion: The snake had to go. But besides shipping in a trained army of mongooses, poison would be the only solution. But how do you poison an entire species out of a region without seriously damaging the other fauna and flora in the process? Three words: skydiving mice assassins.
As it turns out, acetaminophen (better known as Tylenol) does more than relieve pain and lower your fever; it's a tailor-made poison for snakes. The drug prevents their blood from carrying oxygen, and despite looking like demon spawn from hell, brown tree snakes need oxygen to live just like the rest of us. When it came to finding a way to deliver the acetaminophen to snakes quick enough that there would still be some birds left, the people of Guam came up with an ingenious solution: They stuffed the acetaminophen inside dead mice and sent them parachuting into the treetops.