Yellow-faced warbler of western coniferous forests. Males are almost entirely yellow-headed with black nape and throat, gray upperparts with white wingbars, and whitish underparts. Females much duller with pale throat and dingy gray belly, and always show a blank yellow face (some with faint olive cheek patch). Hybridizes with Townsend's Warbler where ranges overlap. Favors conifers on breeding and wintering grounds. Migrants found in a variety of wooded habitats. Feeds on insects, often high in treetops.