Back in the 1950s, brown tree snakes arrived in Guam, and thought "Ah, paradise." They have thrived on the small island, which is now home to something like 2 million of them -- much to the chagrin of local birds and the U.S. military, which has to deal with regular snake-caused power failures at the Andersen Air Force Base. So the Air Force is sending in the mice. NBC News reports:
They floated down from the sky Sunday -- 2,000 mice, wafting on tiny cardboard parachutes … the rodent commandos didn't know they were on a mission: to help eradicate the brown tree snake, an invasive species that has caused millions of dollars in wildlife and commercial losses since it arrived a few decades ago.
That's because they were dead. And pumped full of painkillers.