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Natural Hybrid Toads, Bufo punctatus × Bufo woodhousei, from Colorado

Clarence J. McCoy, Hobart M. Smith and J. A. Tihen
The Southwestern Naturalist
Vol. 12, No. 1 (Apr. 20, 1967), pp. 45-54
DOI: 10.2307/3669147
Stable URL: http://www.jstor.org/stable/3669147
Page Count: 10
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Natural Hybrid Toads, Bufo punctatus × Bufo woodhousei, from Colorado
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Abstract

Four specimens of an undescribed form of toad (Bufo) collected in Echo Canyon, near the Colorado National Monument, Mesa County, Colorado, are identified as the first recorded natural hybrids between the species Bufo punctatus and Bufo woodhousei. The hybrids were taken in association with individuals of both species, and share a combination of the external and osteological characters of the parent species. Unusual ecological conditions at Echo Canyon have permitted the development of mixed breeding choruses of valley and canyon anuran species, and the restricted habitat enhances the chance for accidental mis-matings.

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