California Red-legged Frog vs. American Bullfrog

Bullfrogs have been brought into nearly every pond the California Red-legged lives in. A: A ridge down each side of the back in the California Red-legged Frog; no ridge down the back: a fold from the eye curves round the eardrum in the American Bullfrog. B: Dark spots, often pale-centred in the California Red-legged Frog; plain or finely speckled in the American Bullfrog.

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

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