Found in open areas, including mountainous terrain and areas near cliffs and canyons.

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Although the upperparts are dark, the underside of the swift exhibits contrasting black-and-white pattern, including white throat; note also forked tail. Twittering call may sometimes be heard in the middle fo the night; once learned, it is easy to use this attribute to identify this species. 

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Nest is usually placed in rock crevice of cliff or canyon wall. Feeds on insects caught in flight.