The White-throated Swift is a slender, aerial bird associated with cliffs and canyons in western North America.
It has a dark body with white on the throat and chest, and long narrow wings for fast flight.
It catches insects in flight and nests in rock crevices, fastening nest material to the surface with saliva.
Both adults feed the nestlings, catching flies, beetles, bugs, bees, wasps, flying ants and spiders in the air.
At a Glendale, California highway overpass studied during 1997–2006, four nests first found with eggs held four, four, four and five eggs.
In the Glendale nests, chicks hatched pink-skinned, naked and with closed eyes; the eyes were partly open at 8–10 days and fully open by day 15.
An extinction-risk assessment has not been added yet.