Cryptic nightbird, more often heard than seen. Listen for namesake song, a whistled "whip-poor-WILL," repeated endlessly. Rolling and more trilled than Eastern Whip-poor-will song. Found in forests in foothills and canyons, often with a mixture of pines and deciduous trees, and open areas nearby for foraging. Forages at night from the ground for flying insects. Intricately patterned with gray, brown, and black. Similar to Common Poorwill but with longer tail, different voice, and different habitat. Eastern and Mexican Whip-poor-wills were recently split into separate species; they differ mainly in voice and do not overlap in range.