A broad white rump stands out against its black upperparts, which may shine blue. It catches insects high over forested hills.
The upperparts are black and may shine glossy blue. A broad white rump-band and white underparts stand out; the tail is short and square.
It catches beetles and other insects high above the forest, often in small groups.
It breeds in tree holes from February to May, usually singly, though several nests are sometimes found close together.
The outer wing is hooked, the middle bulges, and the wing narrows at the body; the underwing is black.
An extinction-risk assessment has not been added yet.