37" (94 cm); wingspan 84-90" (213.5-228.5 cm). Adults have a white body, including the back, and a b… read more
ADULT Has mainly dark brown plumage, but tail is noticeably darker than back and most birds show var… read more
ALL BIRDS (not possible to age birds at sea in our region) Have mainly buffish brown upperparts with… read more
ADULT Pale morph has blue-gray upper wings, back, and tail. Head and underparts are white. Note dark… read more
ALL BIRDS Have uniformly dark brown upperparts, but mainly pale underparts: throat and belly are whi… read more
ALL BIRDS (ages are not separable in the field) Have dark grayish brown upper wing coverts and mantl… read more
ALL BIRDS (not possible to age birds in the field in our region) Can appear all-dark at a distance, … read more
ALL BIRDS (ages are not separable at sea) Have blackish brown upperparts and mostly white underparts… read more
ALL BIRDS Have more blackish upperparts (not so dark brown, as in Audubon's) and mainly white underp… read more
ALL BIRDS Can appear all-dark at a distance, but in good light plumage is mainly sooty brown. Pale u… read more
ALL BIRDS Have dark gray-brown plumage, palest on underside of flight feathers and with pale bar on … read more
ALL ADULTS Have mostly very dark blackish brown plumage except for white rump; upper wings have fain… read more
ALL BIRDS Mainly pale gray, but note dark and white pattern on upper wing coverts that creates a str… read more
ALL BIRDS Sooty gray, but can look all-dark at a distance, except for pale panel on upper wing cover… read more
ADULT Has essentially white body plumage with black wingtips (primaries). Note the buffy yellow wash… read more
Adult has a white belly, undertail coverts, and underwing coverts, but otherwise dark brown plumage;… read more
ADULT MALE Mostly all-dark, but purple sheen is seen in good light. Bright red throat sac is inflate… read more
Adult has mostly sooty brown plumage, but with white cap and nape; juvenile is similar, but with dar… read more
ADULT SUMMER Has mainly gray upperparts, but head and neck, along with breast and belly, are black; … read more
ADULT SUMMER Has pale blue-gray back and upper wings, except for white trailing edge and dark wingti… read more
ADULT SUMMER Has dark gray back and upper wings, except for white trailing edge and dark tips to win… read more
ADULT SUMMER Has gray back and upper wings with white trailing edge and black wingtips with small wh… read more
ADULT SUMMER Has blue-gray back and upper wings except for white trailing edge and black wingtips wi… read more
ADULT SUMMER Has pale gray back and upper wing, except for white-spotted black wingtips and pale tra… read more
ADULT SUMMER Has dark gray back and upper wings. Black wingtips are appreciably darker than rest of … read more
ADULT SUMMER Has pale bluegray back and upper wings with white trailing edge and white "windows" on … read more
ADULT SUMMER Has a pale gray back and upper wings with a white trailing edge and pale gray subtermin… read more
ADULT SUMMER Has dark gray upperparts and paler gray underparts including neck. Head is white, bill … read more
ADULT SUMMER Has very pale gray back and upper wings with white trailing edge and wingtips. Plumage … read more
ADULT SUMMER Has mostly uniformly dark back and upper wings (wingtips sometimes appear very marginal… read more
ADULT Has dark gray back and upper wings, except for white trailing edge and black wingtips with whi… read more
ADULT SUMMER Has pale gray back and upper wings, white underparts and neck, and blackish hood. Bill … read more
ADULT SUMMER Has mainly dark gray back and upper wings, with white trailing edge and black and white… read more
Adult has white leading edge to wing and dark trailing edge to outer upper wing. Has a dark brown ho… read more
ADULT SUMMER Has pale gray back and upper wings with white trailing edge and black primaries with lo… read more
Adult has pure white plumage, with black legs and eye, and yellow-tipped blue bill. First-winter is … read more
Adult has pale gray back and upper wing, gray underwings, and otherwise mostly white plumage, includ… read more
Adult recalls Black-legged Kittiwake, but has bright red legs. Compared to Black-legged, adult's yel… read more
ADULT SUMMER Has pale gray back and upper wings, except for white trailing edge and well-defined bla… read more
ADULT SUMMER Has mainly black upper wings and back, continuous with black cap and back of neck; fore… read more
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