Northern Red-legged Frog vs. Columbia Spotted Frog

Brown pond frogs with red or orange underneath. Their ranges meet only in southern British Columbia; in Oregon the Red-legged is west of the Cascades and the Columbia Spotted east. A: Red under the hind legs, looking painted from within in the Northern Red-legged Frog; salmon-orange belly, looking painted on in the Columbia Spotted Frog. B: Eyes face to the side in the Northern Red-legged Frog; eyes turned up, set high in the Columbia Spotted Frog. C: A dark mask edged below by a pale jaw stripe in the Northern Red-legged Frog; a pale jaw stripe but a weak or no mask in the Columbia Spotted Frog. The Red-legged has longer legs and smaller, fainter spots.

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

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