The desert night lizard, Xantusia vigilis, is a night lizard native to southern California east of the Sierras and San Gabriel Mountains into Baja California, southern Nevada, southwestern Utah and extreme western Arizona. It is a secretive lizard of arid and semi-arid locales. During the day it may be found under fallen debris of desert plants and in rock crevices. It is usually associated with varieties of yucca such as the Joshua Tree, Spanish Dagger, and Spanish Bayonet. The yucca night lizard, Xantusia vigilis vigilis, is a subspecies.