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
ADULT Uniform gray-brown on back and upperside of inner wing, contrasting with dark outer half of wi… read more
South Polar Skua
Stercorarius maccormicki (Catharacta maccormicki)
ADULT Dark morph has subtly streaked dark brown plumage, apart from white wing "blazes," and paler n… read more
ADULT Pale phase has a whitish neck, breast, and belly, with variable yellow flush on cheeks and nec… read more
ADULT Pale morph has dark wings (except for white "flash" at base of primaries) and tail. Head has d… read more
Great Skua
Stercorarius skua (Catharacta skua)
ADULT Dark morph has dark brown plumage overall, with rufous-buff tips to many feathers. Note the wh… read more
Adult recalls much more numerous Arctic, but back and upper wings are uniformly darker gray (without… read more
Similar to Sooty Tern, with mostly white underparts, except for contrastingly dark flight feathers, … read more
ADULT SUMMER Has gray back and upper wings and mainly black cap, although forehead is white; plumage… read more
9" (22 cm). California's smallest tern. Summer: back and wings silvery; neck and underparts white; c… read more
ADULT summer Has pale gray back and upper wing and mainly white underparts. In flight, however, note… read more
ADULT SUMMER Has pale gray upperparts, black, crested crown and whitish underparts, palest on head a… read more
ADULT SUMMER Has mainly pale gray back and upper wings, black cap, and otherwise white plumage. Legs… read more
Adult has mostly white underparts, with subtly darker flight feathers, and mostly black upperparts, … read more
ADULT SUMMER Has gray upperparts, black cap, and whitish gray underparts. Compared to Arctic, note b… read more
ADULT SUMMER Pale gray above and whitish below, palest on head and neck. Has a black cap and, in fli… read more
ADULT summer Has pale gray upperparts, black crown and nape, and white underparts. In flight, wings … read more
ADULT SUMMER Has gray upperparts, with black cap; underparts are palest on throat and cheeks and dar… read more
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