Sonoran Desert Toad vs. American Bullfrog

Both are big, smooth, olive frogs of Arizona's canals, stock tanks and rivers. A: Long, raised, kidney-shaped glands in the Sonoran Desert Toad; no glands; a fold curves round a big eardrum in the American Bullfrog. B: Big raised glands on the legs; short legs for walking in the Sonoran Desert Toad; long, smooth legs for jumping; no leg glands in the American Bullfrog.

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

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