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Hemiprocnidae

Hemiprocnidae (tree swifts; class Aves, order Apodiformes) A family of brown or grey swifts, many of which have a blue or green gloss to some feathers. The head is often crested, with white stripes above and below the eye. They have a non-reversible hallux, and are less aerial than other swifts, perching in trees. They inhabit forest edges and clearings, feed on insects, and build their nests on the sides of branches. There is one genus with four species, found in India, south-east Asia, Indonesia, and New Guinea.

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