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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.
This species has been introduced to the U.S. territory of Guam. In 1993 a brown tree snake was found in Corpus Christi, Texas in a shipment of cargo from Guam (McCoid et al.1994). As of 2010, this species is not reported in Texas.he brown tree snake is an effective predator of small vertebrates, including birds and lizards. The brown tree snake has decimated bird populations in Guam. The species also causes frequent power outages by climbing onto power lines and wooden poles (USGS Date unknown) and is a noted agricultural pest (ISSG 2006a).