Small, rather chunky but long-tailed bird of tropical forest and woodland in lowlands and foothills; endemic to western Mexico. Feeds at all levels, often at fruiting trees and bushes with other vireos and fruit-eating birds. Like most vireos, generally rather sluggish. Bright yellow-and-greenish plumage, plus cocked tail, strongly suggest smaller and more lightly built Wilson’s Warbler, but note the vireo’s broad pale eyebrow, stouter bill, and stronger blue-gray legs.