The black-tailed gnatcatcher (Polioptila melanura) has a long black tail lined with white outer feathers. A small, insectivorous bird which is found in arid desert areas year-round, particularly the Sonoran and Chihuahuan Deserts of the southwestern United States and northern Mexico. Females are greyish above and whitish below. The tail is mostly black with white tips on the outer tail feathers which are visible in flight and from underneath.
Black tailed gnatcatcher, female