Pairs of Black-tailed Gnatcatchers are a common sight in open desert scrub where they are constantly flitting through the low vegetation moving their long tails up and down and side to side. They catch small insects and spiders on leaves and often fly up to hover and snatch insects off more inaccessible vegetation. The small cup-shaped nest is placed low in a fork of a small bush or tree. It is constructed of downy plant material and spider webbing. The male has a blackish cap during the breeding season but loses it in the winter.
The four-digit banding code is BTGN.
