A large storm petrel with white feather shafts on the wings and a long forked tail; it feeds on small fish and crustaceans at the sea surface.
It has a dark body, long angular wings with broad buff-brown crescents above, a long forked tail, and distinct white shafts at the bases of the wing feathers.
It breeds from January to July on Minami-Iwo-Jima, nesting in colonies in burrows on high ground. It picks small fish and planktonic crustaceans from the sea surface.
An extinction-risk assessment has not been added yet.