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The black-billed gull (Chroicocephalus bulleri), also called Buller's gull or tarāpuka , is a Near Threatened species of gull in the family Laridae. [ 3 ] [ 4 ] [ 5 ] This gull is found only in New Zealand , its ancestors having arrived from Australia around 250,000 years ago.
The black-headed gull (Chroicocephalus ridibundus) is a small gull that breeds in much of the Palearctic in Europe and Asia, and also locally in smaller numbers in coastal eastern Canada. Most of the population is migratory and winters further south, but many also remain in the milder areas of northwestern Europe.
The adult great black-backed gull is fairly distinctive, as no other very large gull with black on its upper-wings generally occurs in the North Atlantic. In other white-headed North Atlantic gulls, the mantle is generally a lighter grey and, in some species, it is a light powdery grey or even pinkish. [11]
A bird seen in December 2001 at Belhaven Bay, Lothian, and present each winter since (until at least 2005/6) is believed to be a hybrid between black-headed and common gulls. [5] More rarely, hybrids have been reported between laughing gull and black-headed gull, laughing gull and ring-billed gull and possibly black-headed and ring-billed gull ...
The Pacific gull is a large white-headed gull with a distinctively heavy bill.. Gulls range in size from the little gull, at 120 grams (4 + 1 ⁄ 4 ounces) and 29 centimetres (11 + 1 ⁄ 2 inches), to the great black-backed gull, at 1.75 kg (3 lb 14 oz) and 76 cm (30 in).
The species range from 28 cm up to 48 cm long, with Bonaparte's gull being the smallest, and Andean gull the largest. In all species, the body and tail are white, and the upperwing pale grey; the wingtips have distinct grey, white, and black patterns important for identification.
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This is a fairly large and powerful tern, similar in size and general appearance to a Sandwich tern, but the short thick gull-like bill, broad wings, long legs and robust body are distinctive. The summer adult has grey upperparts, white underparts, a black cap, strong black bill and black legs. The call is a characteristic ker-wik. It is 33 ...