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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 Guam kingfisher is a medium-sized kingfisher with a large, strong beak. The Guam subspecies is sexually dimorphic in color with males blue above and rusty cinnamon below and females similar but with white underparts. The Guam kingfisher is no longer found in the wild where it was driven almost to extinction by predation by the brown tree snake (Boiga irregularis) that was introduced to the island.