Dull sparrow lacking distinctive patterns. Found in grasslands with scattered bushes. Generally grayish-brown with barely noticeable blurry streaks on breast and sides, thin white eyering, and pale edges on wing feathers. Back is patterned with rufous and black. Very diffuse head pattern. Most similar to Botteri's Sparrow; where range overlaps, look for Cassin's smaller bill, thin white eyering, and voice. Gives a pleasant musical song; a few varied notes followed by four whistles on different pitches "see-soo, see-say."