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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).
Most birds have four toes, typically three facing forward and one pointing backward. [7] [10] [8] In a typical perching bird, they consist respectively of 3, 4, 5 and 2 phalanges. [2] Some birds, like the sanderling, have only the forward-facing toes; these are called tridactyl feet while the ostrich have only two toes (didactyl feet).
About one half of bird species with fovea have a single one, but uniquely in birds, [221] some, such as terns, kingfishers and hummingbirds, have a second fovea, [222] called the temporal fovea, that assists in judging speed and distance and increases visual acuity. Birds that do not have a second fovea will sometimes bob their head to improve ...
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Some extinct predatory telluravian birds had talons similar to those of modern birds of prey, including mousebird relatives (Sandcoleidae), [6] and Messelasturidae indicating possible common descent. Some Enantiornithes also had such talons, [7] indicating possible convergent evolution, as enanthiornithines weren't even modern birds.
Gaping is part of the shark agonistic display, and is also found in snakes such as the cottonmouth, and in birds ranging from seagulls to puffins to roosters. A number of species of bird use a gaping, open beak in their fear and threat displays. Some augment the display by hissing or breathing heavily, while others clap their beaks. [2]
For example, many weekday newspaper puzzles (such as the American New York Times crossword puzzle) are 15×15 squares, while weekend puzzles may be 21×21, 23×23, or 25×25. The New York Times puzzles also set a common pattern for American crosswords by increasing in difficulty throughout the week: their Monday puzzles are the easiest and the ...
Some fully-fledged or adult birds observed to be hunted in flight or on the ground by great black-backed gulls have included Anas ducks, ruddy ducks (Oxyura jamaicensis), buffleheads (Bucephala albeola), Manx shearwaters (Puffinus puffinus), pied-billed grebes (Podilymbus podiceps), common moorhens (Gallinula chloropus), terns, Atlantic puffins ...