Tarahumara Frog vs. American Bullfrog

The Tarahumara Frog lives in rocky canyon pools of the Santa Rita Mountains, where introduced bullfrogs also turn up. A: Hard to see, not ringed by a big fold in the Tarahumara Frog; big and obvious, with a fold of skin curling round it in the American Bullfrog. B: Rough and bumpy, brown with an olive or yellow-orange wash and faint dark spots in the Tarahumara Frog; smoother, green or olive in the American Bullfrog. A bullfrog grows much bigger (to 8 in) and has a white chin mottled grey.

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

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