Large yellow-bellied flycatcher with gray head, greenish back, and brownish wings and tail. Relatively stout bill. Nearly identical to Tropical Kingbird and very similar to other yellow-bellied kingbirds. Distinguished from Tropical Kingbird by voice: single "pick" or "breer" calls rather than sharp excited twitters. Larger than Western and Cassin's Kingbirds, with richer green back and brighter yellow belly. Primarily a Mexican species with very limited range in the U.S. where it is found in brushy woodlands, often near water.