Cassin's Sparrow

Peucaea cassinii



Welcome to the Birds of North America Online!

You are currently viewing one of the free species accounts available in our complimentary tour of Birds of North America. In this courtesy review, you can access all the life history articles and the multimedia galleries associated with this species.

For complete access to all species accounts, a subscription is required.

Subscribe Now

Already a subscriber? Sign In

Internal Anatomy

Wolf (3) presented measurements of humerus, ulna, carpus, femur, tibiotarsus, tarsometatarsus. Cassin's Sparrow has relatively long legs compared to other sparrows in the genus Peucaea.

Mean testis size: 4.99 g (n = 12; mean body mass of sampled birds = 18.2 g) (27). Testis size is relatively small compared to body size, the smallest testis/body ratio of 19 North American sparrows. Four species with smallest ratios were all in xeric grasslands (27).

Recommended Citation

Dunning, J. B., Jr., R. K. Bowers Jr., S. J. Suter, and C. E. Bock (2018). Cassin's Sparrow (Peucaea cassinii), version 2.0. In The Birds of North America (P. G. Rodewald, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA.