Foothill Yellow-legged Frog vs. American Bullfrog

Young Bullfrogs live in the same streams and reservoirs; their records overlap widely. A: Rough, pebbly, faint ridges, small eardrum in the Foothill Yellow-legged Frog; smooth, a fold curving round a big eardrum in the American Bullfrog. B: Yellow in the Foothill Yellow-legged Frog; no yellow: pale with dark mottling in the American Bullfrog.

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

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