Columbia Spotted Frog vs. American Bullfrog

Both are large brown or olive pond frogs. A: the Columbia Spotted Frog has a ridge (dorsolateral fold) along each side of the back, often faint; the Bullfrog has none, only a fold from the eye curving down around the big eardrum. B: the Columbia Spotted Frog's back carries scattered dark spots, often with pale centres; the Bullfrog's back is plain or finely mottled. Underneath, the Columbia Spotted Frog is salmon-orange; the Bullfrog is white or cream, often mottled. Bullfrogs are introduced in Wyoming.

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

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