Swifts (us-RGV)

From WikiBird

Apodidae

The swifts are birds superficially similar to swallows but are completely unrelated to those passerine species; swifts are in the separate order Apodiformes, which they formerly shared with the hummingbirds. Swifts are the most aerial of birds and some, like the Common Swift, even sleep and mate on the wing.

Like swallows and martins, the swifts of temperate regions are strongly migratory and winter in the tropics.

Many swifts 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.

Genus: Cypseloides