The head and upperparts are dark gray-brown, the throat and upper breast are gray-white, and the lower parts are darker. It nests in caves on its native islands.
Its head and upperparts are dark gray-brown, its throat and upper breast are gray-white, and its lower parts are darker gray.
It roosts and nests in caves, attaching shallow nests to limestone ceilings with saliva. Numbers on Guam declined sharply after brown treesnakes were introduced.
In the 1987–1990 breeding study on Saipan, all 404 recorded clutches held a single white egg.
For 22 eggs there, incubation was estimated to average about 23 days.
Newly hatched chicks there were naked, with pink skin and no natal down. Their eyes were open at about 20–21 days after hatching.
An extinction-risk assessment has not been added yet.