Guam airport. Jack Russel Terrier searching, sniffing for brown tree snakes in the freight section of the airport. They want to keep the snakes from spreading to other islands or the mainland USA. There are no birds on the Pacific Island of Guam thanks to the Brown Tree Snake. These hungry egg-eating snakes have overrun the tropical island after arriving on a lumber freighter from New Guinea during World War II. Besides wiping out the bird population, Brown Tree Snakes cause frequent power outages: they commit short circuit suicide when climbing between power lines.