Comments: In arid or semi-arid habitat. In shrubby areas in rocky canyons and cliffs, rock slides, boulder-strewn slopes, arroyos with sparse vegetation. Seen around concrete and stone buildings. Nests in gopher burrows, rock crevices, cavities under rocks, adobe buildings, etc. Nest sites may be reused in subsequent years. Nest is made of grasses, rootlets, and plant stems, lined with fur, hair and feathers, and built on a foundation of small flat stones (e.g., see Merola 1995).