Hypotaenidia owstoni Rothschild, 1895, Guam. Monotypic.
OTHER COMMON NAMES
French: Rвle de Guam; German: Guamralle; Spanish: Rascуn de Guam.
11 in (28 cm); 6–10.7 oz (170–303 g). Nearly flightless. Upperparts olive-brown; foreneck to breast gray; underparts and remiges barred black and white. Juvenile has less gray; chick covered with black down.
Formerly on Guam, Mariana Island. Reintroduced to Rota, northern Mariana Island, and Guam.
Forest, woodland, scrub, grassland, and agriculture.
Territorial; secretive and wary.
FEEDING ECOLOGY AND DIET
Opportunistic and omnivorous, taking mollusks, insects, geckos, seeds, fish, and carrion. Often forages at edges of fields and roads.
Monogamous. Breeds all year. Nest a cup of grass, on dry ground in dense grass; eggs one to four (usually three to four); white to pinkish in color with small spots of pink or blue concentrated at the large end. Incubation 19 days; young sexually mature at 16 weeks.
Formerly abundant throughout Guam, despite being hunted; 1960s population estimated at 80,000. After 1968 it declined rapidly due to predation by the accidentally introduced brown tree snake (Boiga irregularis), and by 1987 it was Extinct in the Wild. It survives in captive-breeding facilities on Guam and at 14 zoos in the United States (about 180 birds in 1999). From 1987 birds were introduced to the snake-free island of Rota, where they bred from 1999. It was reintroduced to Guam in 1998, into a protected area.
SIGNIFICANCE TO HUMANS
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