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With 22cm a large Swift.
 Similar Species
Has been placed as only species in genus Semicollum or together with Great Dusky Swift in genus Aerornis.
Found in the mountains of West Mexico around gorges, cliffs, high crags, up to 3600m. Usually over pine-oak forest, tropical deciduous forest and scrub. Sometimes seen over coastal slopes.
Resident with only little movement.
Feeds on insects, taken in flight.
Breeds in May in small colonies in caves. Builds a nest with plant material and mud, sometimes no nest at all. Lays two eggs.
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