Williamson's Sapsucker (Sphyrapicus thyroideus) is a medium-to large-sized (21-25 cm) woodpecker that lives in the mountains of western North America, from southern British Columbia to central Mexico. They inhabit middle to high elevation conifer and mixed conifer forests of northern and western New Mexico. They drill holes in trees to eat sap and phloem fibers; they also eat insects and fruits.