Northern Red-legged Frog vs. American Bullfrog

Introduced Bullfrogs live in many north coast ponds with the Northern Red-legged Frog; their records overlap there. A: A ridge down each side of the back in the Northern Red-legged Frog; no ridge; a fold curves round the eardrum in the American Bullfrog. B: Brown or reddish with small dark flecks and a dark mask in the Northern Red-legged Frog; green to olive, plain or mottled in the American Bullfrog. The Red-legged Frog is red under the legs; the Bullfrog's eardrum is big, as large as the eye or larger.

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

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