Western Narrow-mouthed Toad vs. Eastern Narrow-mouthed Toad

Both are small, plump, smooth toads with a pointed head and a fold of skin across the head behind the eyes. A: the Western's belly is plain white, cream or pale yellow; the Eastern's belly and throat are densely mottled with dark grey or brown. (Males of both have a dark throat.) B: the Western is pale and cool: olive-green, grey-green, pale grey or light tan. The Eastern is darker and warmer: reddish-brown, dark slate, tan or chocolate. C: the Western is usually plain, with at most small scattered black dots; the Eastern has a broad dark band, flanked by lighter, irregular stripes along the sides of the back. In Nebraska only the Western occurs; the two meet in Kansas, Missouri and Oklahoma.

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

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