The underside of the wings is white with dark tips and edges. It breeds on the Juan Fernández Islands and ranges over the open Pacific outside the breeding season.
The underside of the wings is white, with dark markings at the tips and along the edges. The upperparts are dark.
It takes fish and molluscs from the sea surface and sometimes dives for food. It spends the nonbreeding season over the open ocean; detailed breeding behavior is poorly known.
An extinction-risk assessment has not been added yet.