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Cassin's Sparrow - BirdForum Opus

Photo by Steve Messick
Riverside Reservoir, Weld County, Colorado, June 2004
Peucaea cassinii

Aimophila cassinii


13-15 cm (5-6 in)

  • Grey brown
  • Back appears scalloped
  • Grey eyestripe
  • Small yellow patch at bend of wing
  • White tipped tail
  • Dark brown iris
  • Upper mandible dark grey brown, lower blue grey
  • Dark pink legs

Sexes alike


Breeds in western Colorado, in the southwest corner of Nebraska, western Kansas and Oklahoma, western half of Texas, south and eastern New Mexico, and far southwestern Arizona as well as much of Mexico.

Winters in southern Texas, New Mexico, Arizona, and Mexico Accidental vagrant to northeast (New York, Maine, New Jersey and Nova Scotia), midwest (Ohio, Ontario, Illinois, Indiana and Michigan) and in the west (California (several records) and Nevada).


This is a monotypic species1.

Was formerly placed in genus Aimophila.


Dry grasslands with scattered small trees and shrubs.



Their main diet consists of seeds; however insects, particularly grasshoppers, bugs, ants and wasps are consumed during the nesting period.


The nest is an open cup made from grass, lined with fine grasses. The clutch consists of 3-5 white eggs.


  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. 51st supplement to the AOU checklist of North American birds
  3. All About Birds

Recommended Citation

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