Common Name

Scientific Name

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Cassinís vireo, Vireo cassinii, is a small bird that breeds in the mountains of California, Baja California, the northwestern United States, and southwestern Canada; it winters in the southwestern United States, Mexico, and Central America. In Utah, Cassinís vireo is considered an uncommon migrant, although breeding bird survey data suggest that the species may occur in northwestern Utah during its breeding season.

Cassinís vireo prefers woodland habitats, and the diet of the species consists primarily of insects. Prior to its recent recognition as a distinct species, Cassinís vireo was considered to be the solitary vireo.


  • Biotics Database. 2005. Utah Division of Wildlife Resources, NatureServe, and the network of Natural Heritage Programs and Conservation Data Centers.

  • Ehrlich, P. R., D. S. Dobkin, and D. Wheye. 1988. The birderís handbook[:] a field guide to the natural history of North American birds. Simon & Schuster, New York. xxx + 785 pp.