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The high haemoglobin concentration in their blood gives them a capacity to store oxygen greater than that of other birds, allowing them to remain underwater for 30 seconds or more, [9] whilst their basal metabolic rate is approximately one-third slower than typical terrestrial passerines of similar mass. [14]
It is a stocky grey bird with a head sometimes tinged with brown, and white feathers on the eyelids that cause the eyes to flash white as the bird blinks. It is 16.5 cm (6.5 in) long, has a wingspan of 23 cm (9.1 in), [2] and weighs on average 46 g (1.6 oz). The name "dipper" derives from its long legs, which it uses to bob its whole body up ...
Young chicks may also be held under the wing and transported to safety by the parent bird in some species. [21] Young chicks dive underwater and stay submerged with only their bill out of water. Some adult jacanas also use the same technique. African jacanas go through a simultaneous moult of their flight feathers leading to a period of ...
Such birds may enter the water from flight, such as pelicans, gannets and tropicbirds; or they may dive from the surface of the water, such as the diving ducks, cormorants and penguins. It is theorized that they evolved from birds already adapted for swimming that were equipped with such adaptations as lobed or webbed feet for propulsion. [1]
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They shed the colorful outer parts of their bills after the breeding season, leaving a smaller and duller beak. Their short wings are adapted for swimming with a flying technique underwater. In the air, they beat their wings rapidly (up to 400 times per minute) [1] in swift flight, often flying low over the ocean's surface.
Geese and ducks are just two types of water birds, which include seabirds, shorebirds, waterfowl, and numerous other forms of birds. Video of gulls, ducks, and swans feeding on the Danube River in Vienna (2014) A water bird, alternatively waterbird or aquatic bird, is a bird that lives on or around water.
The word anhinga comes from a'ñinga in the Brazilian Tupi language and means "devil bird" or "snake bird". [3] The origin of the name is apparent when swimming: only the neck appears above water, so the bird looks like a snake ready to strike. They do not have external nares (nostrils) and breathe solely through their epiglottis.