Northern Leopard Frog vs. American Bullfrog

Both live in the ponds, stock tanks and streams of the Colorado Plateau and the White Mountains; young bullfrogs are about the size of a leopard frog. A: Two pale ridges running from the eye to the hips in the Northern Leopard Frog; no ridges; a fold curves round the big eardrum in the American Bullfrog. B: Round dark spots edged pale in the Northern Leopard Frog; plain green or with faint mottling in the American Bullfrog.

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

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