シロエリガラス Corvus cryptoleucus

The raven of dry grasslands and desert scrub from the southwestern U.S. to central Mexico. Very similar to Common Raven, and sometimes best left unidentified. Chihuahuan is slightly smaller and more compact than Common, and tends to be found in more open habitats at lower elevations, not in mountains or forests (although Common can be found in low grasslands, too). Neck feathers are white at the base on Chihuahuan, instead of gray. Occurs in pairs or flocks, sometimes quite large, especially in winter. Gives a rather dry, crow-like squawk.