California Red-legged Frog vs. Northern Red-legged Frog

The two meet and mix in Mendocino County; their records overlap there. Range decides most of the time. A: Bold dark spots and blotches in the California Red-legged Frog; small, faint dark flecks in the Northern Red-legged Frog. B: Rougher, with many small bumps in the California Red-legged Frog; smooth in the Northern Red-legged Frog. C: Red on the lower belly and under the legs in the California Red-legged Frog; red under the hind legs in the Northern Red-legged Frog. The California Red-legged grows much larger (to 5.5 in vs 4 in).

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

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