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Bonaparte`s Gull is one of the smallest North American gull. The small size12"-14"( 33 cm) and light bouyant flight of They are reminescent of terns.Widespreads range from 24 to 63 in. (0.6-1.6 m).
Summer adults have black heads,gray mantles and white underparts and tail. The wings show white outer primaries with black trailing edges. The bill is slender and black. The legs and the feet are reddish-orange. In winter,the black head becames white with dark round spot behind the eye. Juveniles show dark ear spot on the head. They have brown on the mantle, scapulars and sides of the breast. The tail is white with a black terminal band. The legs are pinkish. By late September, young birds have molted into the first winter plumage, characterized by a narrow dark bar on the upperwings, a dark leading edge to the primaries,which together form an "M" across the upper surface of the wings. They lose the juvenile`s brown but retain the terminal band on the tail. In their first summer, they begin to show a dark hood, and the"M" pattern on the wings begins to fade through wear.Bonaparte`s Gull attain adult winter plumage in their second year.
Bonaparte`s Gulls present in Racerocks are omnivores. They feed on insects, worms, fish, mollusks, crustaceans in Pedder Bay and in the waters out to Race Rocks. They nest as isolated pairs or in small colonies, in other parts of British Columbia
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