It is blue-gray above, with a black M-shaped wing marking, a black tail tip, and a mostly white underside. It spends much of its life at sea, and its two subspecies nest on different island groups.
It is blue-gray above, with a black M-shaped marking across the wings, a black tail tip, and a mostly white underside. The bill is robust and bluish gray.
It spends most of its life at sea. It probably catches much of its food near its breeding islands, pecking small items from the surface and making brief, shallow dives for small marine invertebrates.
An extinction-risk assessment has not been added yet.