Sierra Nevada Yellow-legged Frog vs. Cascades Frog

Both are mountain frogs of high lakes and meadows; their records touch around Lassen and the northern Sierra. A: Lichen-like mottling in the Sierra Nevada Yellow-legged Frog; bold, separate inky-black spots in the Cascades Frog. B: Faint or missing in the Sierra Nevada Yellow-legged Frog; clear ridges down each side of the back in the Cascades Frog. Both have yellow under the legs.

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

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