Drab olive overall with white eyering, bold wingbars, and thick bill. Found in forested areas with a mix of oak and conifers, usually foraging in the middle levels. Often in mixed flocks with other small songbirds. Resident along the Pacific coast from British Columbia to northern Baja and in interior mountains from Arizona and Texas to Guatemala. Remarkably similar to Ruby-crowned Kinglet, but thicker-billed and more sluggish; also note bluish legs. Also compare with Dwarf Vireo in Mexico. Listen for distinctive repetitive song of clear or buzzy notes.