Changing the angle between the bones of the wingtips and forelimbs allows swifts to alter the shape and area of their wings to increase their efficiency and maneuverability at various speeds.

This flight arrangement might benefit the bird's control and maneuverability in the air. The swiftlets or cave swiftlets have developed a form of echolocation for navigating through dark cave systems where they roost.

Swifts occur on all the continents except Antarctica, but not in the far north, in large deserts, or on many oceanic islands.

Some species can survive short periods of cold weather by entering torpor , a state similar to hibernation. Many have a characteristic shape, with a short forked tail and very long swept-back wings that resemble a crescent or a boomerang.

The flight of some species is characterised by a distinctive "flicking" action quite different from swallows. Swifts range in size from the pygmy swiftlet Collocalia troglodytes , which weighs 5.

The nest of many species is glued to a vertical surface with saliva, and the genus Aerodramus use only that substance, which is the basis for bird's nest soup.

Other swifts select holes and small cavities in walls. Both parents assist in raising the young. Swifts as a family have smaller egg clutches and much longer and more variable incubation and fledging times than passerines with similarly sized eggs, resembling tubenoses in these developmental factors.

Young birds reach a maximum weight heavier than their parents; they can cope with not being fed for long periods of time, and delay their feather growth when undernourished.

Swifts and seabirds have generally secure nest sites, but their food sources are unreliable, whereas passerines are vulnerable in the nest but food is usually plentiful.

All swifts eat insects, such as aerial spiders, dragonflies, flies, ants, aphids, wasps and bees. Some species, like the chimney swift, hunt with other bird species as well.

No swift species has become extinct since , [17] but BirdLife International assesses the Guam swiftlet as endangered and lists the Atiu , dark-rumped , Schouteden's , Seychelles and Tahiti swiftlets as vulnerable ; twelve other species are near threatened or lack sufficient data for classification.

The hardened saliva nests of the edible-nest swiftlet and the black-nest swiftlet have been used in Chinese cooking for over years, most often as bird's nest soup.

Most nests are built during the breeding season by the male swiftlet over a period of 35 days. They take the shape of a shallow cup stuck to the cave wall.

The nests are composed of interwoven strands of salivary cement and contain high levels of calcium, iron, potassium, and magnesium.

From Wikipedia, the free encyclopedia. Redirected from Swifts. Family of birds. For other uses, see Swift disambiguation.

Temporal range: Eocene to present. Main article: List of swift species. David E. Molecular Phylogenetics and Evolution. Archived from the original PDF on Retrieved BBC News.

London Review of Books. Forshaw, Joseph ed. Encyclopaedia of Animals: Birds. The SWIFT community continued growing to connect more than 9, users from more than countries and territories.

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