It’s hard to find somewhere more remote than Guam, the U.S. territory east of the Philippines that’s part of the Mariana Islands. Its remoteness has been a benefit, especially to the U.S. military, which uses nearly one-third of the island for training and operations. Back in World War Two, the Enola Gay aircraft that dropped atomic bombs on Hiroshima and Nagasaki was serviced on Guam before it flew over Japan.

Since then, Guam have been as ravaged by non-native animals. Beetles that take down entire trees were brought to Guam around 2007. Toads, snails, and vines that demolish native plants have taken over much of the island.

But no invader has been more detrimental than the brown tree snake, a species from