The Cassin's Sparrow (Peucaea cassinii) occur naturally from western Nebraska south to central Mexico.
The back, mantle and scapulars (shoulder feathers) are brown or grey with a rusty ringe. The head is brownish, streaked with dark brown and grey. The abdomen is whitish. The "eye-brows" are buff. They have a thin, darkish stripe extending from the sides of the bill south to the neck. The bill is brownish grey. The irises are dark brown.