The Gray-rumped Swift is a slender, dark swift that forages in flocks in Bolivia.
It is a slender, dark Chaetura swift with a rump that appears slightly paler than the surrounding plumage.
In Bolivia it forages in flocks.
It catches ants, bees, wasps, beetles and flies in flight.
The tail is short and square-ended.
An extinction-risk assessment has not been added yet.