Western Chorus Frog
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[Photo] Western chorus frog (Pseudacris triseriata). Source: USGS, http://www.umesc.usgs.gov/terrestrial/amphibians/armi/species/chorus_frog.html

The Western Chorus Frog or Striped Chorus Frog (Pseudacris triseriata) is a species of tree frog found in Canada and the United States. From southern Quebec to South Dakota, and south to Kansas and Oklahoma.

Description
Western Chorus Frogs are small (1.5 inch or about 40mm), grey or brown frogs with darker brown or grey blotches which extend down the body into almost full stripes. Their underside is typically white or cream colored. They have small toe pads to help climb small grasses, although they are primarily a ground dwelling species.

Taxonomy
P. triseriata was once considered a subspecies of the Southern Chorus Frog, P. nigrita, but was reclassified as its own species with two subspecies, P. t. triseriata and P. t. feriarum. Both of which have since been granted independent full species status.

http://en.wikipedia.org/wiki/Western_Chorus_Frog

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