Upland Chorus Frog vs. Western Chorus Frog

Both have three dark stripes down the back, a dark stripe through the eye and a white upper lip, and both call with a rising, comb-tooth crreek. On an Upland Chorus Frog the three stripes are thin, narrower than the pale spaces between them, and often broken into rows of dashes or spots. On a Western Chorus Frog they are broader, usually continuous and bold, and take up more of the back, leaving narrow pale gaps. The Upland also has relatively longer legs: its shank (tibia) is more than about half the length of its body, so a hind leg folded forward reaches the snout. The Western has shorter legs: the shank is under about 45% of body length, and a folded leg reaches only between the shoulder and the eye. Range helps too: Upland in the Appalachians and the Southeast, Western around the Great Lakes and the Midwest.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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