Tailed Frogs don't actually have tails; the males have a copulatory organ approximately where a tail would be. The only one I've come across so far was a female, so there's no sign of a "tail" here.
Until recently, all tailed frogs were classified in this species, which was the only species in its genus, which is the only genus in its family. A few years ago the population of tailed frogs in the Rocky Mountains was reclassified as a separate species, the aptly-named Rocky Mountain Tailed Frog (Ascaphus montanus).
- Behler, J. L., King, F. W. 1979. The Audubon Society Field Guide to North American Reptiles & Amphibians
- Corkran, C. C., Thoms, C. R. 1996. Amphibians of Oregon, Washington and British Columbia: A Field Identification Guide
- Crother, B. I. (ed.) 2017. Scientific and Standard English Names of Amphibians and Reptiles of North America North of Mexico, with Comments Regarding Confidence in Our Understanding, Eighth Edition
- Elliott, L., Gerhardt, C. and Davidson, C. 2009. The Frogs and Toads of North America
- Stebbins, R. C. 2003. Peterson Field Guide to Western Reptiles and Amphibians, Third Edition