Pacific Chorus Frog vs. Rocky Mountain Tailed Frog

Both are small frogs of western Montana. A: the Pacific Chorus Frog has a bold black stripe from the nostril through the eye to the shoulder and a round pupil; the Tailed Frog's face is mottled, its pupil is vertical (wide open at night, as here) and it has no visible eardrum. B: the Pacific Chorus Frog's skin is smooth and its toes end in small round pads; the Tailed Frog's skin is rough and grainy, its toes have no pads, and males have a short 'tail'. The Pacific Chorus Frog calls 'rib-it' from ponds; the Tailed Frog lives in cold, fast streams and never calls.

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

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