The brown tree snake has become one of the world's best-known examples of an invasive species.
Native to Australia and the South Pacific, the snake likely reached Guam sometime after World War II, possibly by hiding aboard military cargo planes. Its arrival had devastating consequences. Brown tree snakes have driven many of Guam's native forest birds to local extinction, and they cause hundreds of power outages each year by climbing utility poles and electrical equipment.
In some parts of the U.S. territory, their numbers have climbed as high as 30,000 snakes per square mile.
A Snake Invasion That Defied Expectations
The invasion has long puzzled biologists because Guam's population is believed to have begun with only a small number of snakes.
