Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species qualifies as Endangered because it is restricted to four very small islands, including Saipan, where brown tree snake Boiga irregularis
may be in the process of becoming established, and Tinian and Rota where the snake has also been detected. These three islands support 97% of the population. It formerly occurred on Guam, where it was extirpated by brown tree-snake. It is therefore very likely to undergo a rapid overall population decline in the immediate future.
1500-7000 mature individuals
Distribution size (breeding/resident):
Land-mass type - oceanic island - Oceanic islands are islands or island groups that are <200,000 sq km in size and separated from other land masses by >200 m sea depth. Generally Oceanic islands are islands or island groups that are <200,000 sq km in size and separated from other land masses by >200 m sea depth. Generally they have never been connected to a continental area by a land-ridge, and are volcanic in origin.
Realm - Oceanic - realm
IUCN Ecosystem -- Terrestrial biome