The western is the “default” breeding yellow-bellied kingbird across vast areas of the west (especially arid lowlands); but its distribution and habitat overlap with other yellow-bellied kingbirds (the Cassin’s, thick-billed, tropical, and Couch’s) as well as with the eastern and scissor-tailed flycatchers. From exposed perches on trees, shrubs, or wires, it chases and captures flying insects; it will also sally to vegetation or the ground and will take fruit during fall and winter. Monotypic. Length 8.1–9.6".
Adult: pale gray head; darker mask; concealed orange-red central crown patch. Pale grayish olive back. Plain brownish black wings, contrasting paler back. Square-tipped, black tail; white outer webs of outer pair of feathers. White throat subtly blends to pearly gray chest and yellow