Guam Rail Hypotaenidia owstoni

Family: Rallidae (Rails, Gallinules, Coots)

Authority: Rothschild, 1895

Red List Category

Criteria: D

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Justification of Red List category
This species was extirpated from its native range in 1987 following catastrophic declines owing to predation by the introduced brown tree-snake. A captive population survived and individuals have been released on the islands of Rota and Cocos. Only the Cocos island population is considered to be self-sustaining; the area of this island is tiny, so the population must be extremely small. For this reason, the species is listed as Critically Endangered.

Population size: 1-49

Population trend: Increasing

Extent of occurrence (breeding/resident): 4 km2

Country endemic: Yes

Land-mass type - oceanic island
Realm - Oceanic
IUCN Ecosystem -- Terrestrial biome

Recommended citation
BirdLife International (2023) Species factsheet: Hypotaenidia owstoni. Downloaded from on 28/03/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from on 28/03/2023.