Illinois Chorus Frog vs. Western Chorus Frog

Both are early-spring chorus frogs of central and southern Illinois. The Illinois Chorus Frog is plump and toad-like with a short snout, stout forelegs for burrowing, and dark spots in irregular rows down the back; the Western Chorus Frog is slim with three broad, continuous dark stripes down the back and a bold dark stripe from the snout through the eye. By ear the Illinois Chorus Frog gives clear, high, bird-like whistles, the Western a rasp like a thumb run down a comb.

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

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