A wild population of Pacific tree frogs (Hyla regilla) in Idaho exhibited a high incidence (22%) of hind limb abnormalities. This situation is discussed with reference to similar occurrences reported for isolated populations of the species in the Pacific Northwest.
Reynolds, Timothy D. and Stephens, Trent D.
"Multiple ectopic limbs in a wild population of Hyla regilla,"
Great Basin Naturalist: Vol. 44
, Article 20.
Available at: http://scholarsarchive.byu.edu/gbn/vol44/iss1/20