virginia's warbler Leiothlypis virginiae

A mostly gray warbler with yellow undertail coverts and a thin white eyering. All but the dullest immatures show a yellow patch on the breast. Breeds in open woodlands with dense understory, especially mixed piñon-juniper and oak on steep slopes. Winters in western Mexico, where it prefers dense thickets and brushy habitat. Listen for sweet two- or three-parted warble. Compare with Nashville Warbler, but Virginia’s is always duller gray, especially on the back and wings.