River Frog vs. American Bullfrog

Bullfrogs share every River Frog swamp; Outdoor Alabama tells them apart by skin and underside. A: Rough in the River Frog; smooth in the American Bullfrog. B: Dark, mottled with white low on the sides and below in the River Frog; green to olive above, mostly white below in the American Bullfrog. River Frog lips are black with bold white spots, above all the lower lip.

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

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