Spot the bird game ๐Ÿ•Š๐Ÿฆ…๐Ÿฆ†๐Ÿฆœ๐Ÿฅ๐Ÿฃ๐Ÿฆข๐Ÿง๐Ÿ“๐Ÿฆค๐Ÿฆ๐Ÿฆฉ๐Ÿฆš๐Ÿฆƒ๐Ÿฆ‰๐Ÿค

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Like&subscribe ๐Ÿ™๐Ÿ‘๐Ÿฅณ๐Ÿ’–Pelicans (genus Pelecanus) are a genus of large water birds that make up the family Pelecanidae. They are characterized by a long beak and a large throat pouch used for catching prey and draining water from the scooped-up contents before swallowing. They have predominantly pale plumage, except for the brown and Peruvian pelicans. The bills, pouches, and bare facial skin of all pelicans become brightly coloured before the breeding season. The eight living pelican species have a patchy global distribution, ranging latitudinally from the tropics to the temperate zone, though they are absent from interior South America and from polar regions and the open ocean.

Pelican
Temporal range: late Eocene-Recent, 36โ€“0 Ma
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[1]Possible an early origin
Long thought to be related to frigatebirds, cormorants, tropicbirds, and gannets and boobies, pelicans instead are now known to be most closely related to the shoebill and hamerkop, and are placed in the order Pelecaniformes. Ibises, spoonbills, herons, and bitterns have been classified in the same order. Fossil evidence of pelicans dates back at least 36 million years to the remains of a tibiotarsus recovered from late Eocene strata of Egypt that bears striking similarity to modern species of pelican.[1] They are thought to have evolved in the Old World and spread into the Americas; this is reflected in the relationships within the genus as the eight species divide into Old World and New World lineages.[3] This hypothesis is supported by fossil evidence from the oldest pelican taxa.[1]


Pelicans at National Zoo, Bangladesh
Pelicans frequent inland and coastal waters, where they feed principally on fish, catching them at or near the water surface. They are gregarious birds, travelling in flocks, hunting cooperatively, and breeding colonially. Four white-plumaged species tend to nest on the ground, and four brown or grey-plumaged species nest mainly in trees.[4] The relationship between pelicans and people has often been contentious. The birds have been persecuted because of their perceived competition with commercial and recreational fishing.[5] Their populations have fallen through habitat destruction, disturbance, and environmental pollution, and three species are of conservation concern. They also have a long history of cultural significance in mythology, and in Christian and heraldic iconography.

Taxonomy and systematics

Description


A brown pelican opening mouth and inflating air sac to display tongue and some inner bill anatomy

American white pelican with knob which develops on bill before the breeding season

An adult brown pelican with a chick in a nest in Chesapeake Bay, Maryland, US: This species will nest on the ground when no suitable trees are available.[48]

Australian pelican displaying the extent of its throat pouch (Lakes Entrance, Victoria).
Pelicans are very large birds with very long bills characterised by a downcurved hook at the end of the upper mandible, and the attachment of a huge gular pouch to the lower. The slender rami of the lower bill and the flexible tongue muscles form the pouch into a basket for catching fish, and sometimes rainwater,[15] though to not hinder the swallowing of large fish, the tongue itself is tiny.[49] They have a long neck and short stout legs with large, fully webbed feet. Although they are among the heaviest of flying birds,[50] they are relatively light for their apparent bulk because of air pockets in the skeleton and beneath the skin, enabling them to float high in the water.[15] The tail is short and square. The wings are long and broad, suitably shaped for soaring and gliding flight, and have the unusually large number of 30 to 35 secondary flight feathers.[51]

Males are generally larger than females and have longer bills.[15] The smallest species is the brown pelican, small individuals of which can be no more than 2.75 kg (6.1 lb) and 1.06 m (3.5 ft) long, with a wingspan of as little as 1.83 m (6.0 ft). The largest is believed to be the Dalmatian, at up to 15 kg (33 lb) and 1.83 m (6.0 ft) in length, with a maximum wingspan of 3 m (9.8 ft). The Australian pelican's bill may grow up to 0.5 m (1.6 ft) long in large males,[52] the longest of any bird.[4]

Pelicans have mainly light-coloured plumage, the exceptions being the brown and Peruvian pelicans.[53] The bills, pouches, and bare facial skin of all species become brighter before breeding season commences.[54] The throat pouch of the Californian subspecies of the brown pelican turns bright red, and fades to yellow after the eggs are laid, while the throat pouch of the Peruvian pelican turns blue. The American white pelican grows a prominent knob on its bill that is shed once females have laid eggs.[5] The plumage of immature pelicans is darker than that of adults.[53] Newly hatched chicks are naked and pink, darkening to grey or black after 4 to 14 days, then developing a covering of white or grey down.[55]




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