The Cassin’s is fairly widespread at middle elevations in the southwestern and west-central United States, where it overlaps extensively with the western kingbird. Monotypic. Length 8.4–9.2".
Adult: dark gray head and nape (mask less obvious); semiconcealed orange-red central crown patch; dark grayish olive back, brownish wings. Dark gray chest contrasts with white chin, blends to yellow belly and olive flanks. Tail squared or slightly notched; brownish black with an indistinct pale gray terminal band. Relatively small bill. Juvenile: similar but wings edged pale cinnamon and pale tail tip less obvious.
The western has paler upperparts and chest; much less chin-breast contrast; and darker wings and black tail with white outer web of outer feather pair (but beware westerns completely lacking outer
