Black-winged Petrel

The black-winged petrel (Pterodroma nigripennis) is a species of seabird in the family Procellariidae. It breeds on a number of oceanic islands in the tropical and subtropical East Pacific Ocean and spends the rest of the year at sea. The black-winged petrel is a small species of petrel with long, narrow wings. Its length averages 29 centimetres (11 in) and its wingspan averages 67 centimetres (26 in). It has a small head and short black beak, a slender body and square-cut tail. It has a pale grey cap and nape, white cheeks and a dark grey collar. The dorsal surface of the body is pale grey and the upperside of the wings is pale grey near the base but dark greyish-black along the outer edge. The underparts are white and the outer edges of the wings are black. The tail is barred in black and white.