The Whip-poor-will (Caprimulgus vociferus arizonae) has been extending its range northward and westward in recent years as evidenced by records from the Sheep Mountains in southeastern Nevada (Johnson, Condor 67:93-124) and the Hualapai Mountains in western Arizona. Phillips, et al. (The Birds of Arizona, 1964) give the range in Arizona as "common summer resident of Transition and Upper Sonoran zones of southeastern and (in recent years) central Arizona; ranges west to Pajaritos Mountains and northwest less commonly (no specimen) to the Hualapai Mountains."