Sierra Nevada Yellow-legged Frog vs. American Bullfrog

Introduced Bullfrogs reach some lower Sierra lakes and reservoirs; their records overlap at the edges. A: Bold lichen-like dark mottling in the Sierra Nevada Yellow-legged Frog; plain green or with fine dark speckles in the American Bullfrog. B: No fold curving round the eardrum in the Sierra Nevada Yellow-legged Frog; a fold curving round the big eardrum in the American Bullfrog. Bullfrogs grow far larger (to 8 in) and call with a deep jug-o-rum.

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