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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.
The kingfisher population on Guam was federally listed as an endangered species in 1984, but by 1988, was close to becoming extinct, along with the majority of Guamâs other avifauna. The dramatic loss of the avifauna on Guam was a direct result of predation by the introduced brown treesnake. Kingfishers were last reported in southern Guam in the 1970s. A U.S. Fish and Wildlife Service (Service) survey conducted in 1981 estimated the total population remaining in northern Guam to be 3,023.