General Description: Adult Western Gulls (Larus occidentalis) have a very dark mantle with black wingtips, and otherwise the plumage is bright white. The legs and feet are pinkish, and there is a red spot on the lower mandible. In winter plumage, adults get a gray wash and gray spots on the head. Juveniles are very dark and start out with a black bill.
Gulls take 2-4 years to mature. The plumage during the juvenile and subadult years differs from the adult breeding plumage, and the plumage also differs between summer and winter. Thus, there can be 7 or so different plumages for each species of gull, making identification difficult. Western Gulls take four years to mature.
Taxonomy: Charadriiformes, Laridae, Larinae. |