The Guam Rail (Gallirallus owstoni) (Chamorro name: Ko'ko' ) is a flightless bird, endemic to the United States territory of Guam.

The Guam Rail disappeared from southern Guam in the early 1970s and was extirpated from the entire island by the late 1980s.

Two of these species, the Guam Rail and the Micronesian Kingfisher, are being captively bred in zoos in the hope that they can eventually be released back into the wild.

Before the introduction of the brown tree snake, Guam was home to two endemic bird species: The Guam Rail or ko'ko bird in Chamorro and the Guam Flycatcher which were common throughout the island.

Bob Beck, 63, Guamanian zoologist and conservationist, worked to save Guam Rail native birds.

Guam Rail (extinct in the wild since 1980)

It features two birds that are extinct in the wild: the Guam Rail and the Guam Kingfisher, a subspecies of the Micronesian Kingfisher.

Some species include the Micronesian Kingfisher, Guam Rail, Rhinoceros Hornbill, Mariana Fruit Dove, Victoria Crowned Pigeon, and many others.

One species, the Guam Rail, is extinct in the wild; there exists a semi-wild population in preparation for reintroduction to its original habitat.

Guam Rail, Gallirallus owstoni - extinct in the wild (late 1980s)