Canadian Toad vs. Woodhouse's Toad

Both are warty prairie toads. A: the adult Canadian Toad's ridges fuse into a raised hump (boss) between the eyes; Woodhouse's has narrow, prominent ridges that turn at right angles behind the eyes and never form a hump. B: the Canadian's pale back stripe is thin, broken or faint; Woodhouse's is broad, crisp and whitish to yellowish. C: the Canadian's parotoids are oval and set apart from the ridges; Woodhouse's are long and narrow and touch the ridge behind the eye. Woodhouse's calls with a short nasal bleat, the Canadian with a clear trill of about five seconds.

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

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