Slaty-Backed Gull
48. Larus schistisagus. 27 inches.
This large gull, with its almost pure white head and neck and slaty colored back, is one of the prettiest. They often nest in colonies with other gulls, building their small mounds of seaweed on the higher parts of the islands.
Nest.—Usually contains sets of two or three grayish colored eggs, spotted with dark brown and lavender (2.90 × 2.00).
Range.—Northern Pacific and Arctic oceans.