The Williamson's Sapsucker is a handsome woodpecker of montane conifer forest. In the Neotropics, it occurs only as a winter visitor in the mountains of western Mexico, departing in the warmer months for breeding areas in the mountains of the western United States and southwestern Canada. The male is striking, with black plumage overall contrasting with a yellow belly, red throat, and white patches on the wing and face. The duller female is still distinctive, with heavy black barring both above and below. It feeds on arthropods largely by gleaning and a variety of other methods.