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Of 18 species of native Guamanian birds, seven are extinct, two are extinct in the wild (the Guam Rail, pictured left, and the Micronesian Kingfisher survive only in captivity), six are rare, and three are uncommon.n Guam, brown tree snakes found dense forests that were teeming with the birds and small lizards that are their natural foods. No enemies slowed their spread, and their numbers mushroomed. The snake populations moved steadily north at a rate of a mile per year from their southern landfall.
These traps are among 119 placed under or near trees on Guam and the nearby island of Saipan to determine the distribution of tree seeds. In the last 60 years, brown tree snakes have become the embodiment of the bad things that can happen when invasive species are introduced in places where they have few predators.Unchecked for many years, the snakes caused the extinction of nearly every native bird species on the Pacific island of Guam.The brown tree snake has often been used as a textbook example for the negative impacts of invasive species, but after the loss of birds no one has looked at the snakeâs indirect effects,â said Haldre Rogers, a UW doctoral student in biology.