Canyon Tree Frog vs. Red-spotted Toad

Both sit on the same boulders beside canyon pools across much of Arizona, both are small, grey and rough, and both call there on summer nights. A: Big round sticky pads; it climbs rock walls in the Canyon Tree Frog; plain pointed toes, no pads in the Red-spotted Toad. B: No raised glands in the Canyon Tree Frog; a small, round, raised gland behind each eye in the Red-spotted Toad. C: Rough but even, grey to olive with soft darker blotches in the Canyon Tree Frog; warts tipped red or orange in the Red-spotted Toad. Calls differ: an explosive nasal rattle of 1 to 3 seconds, like a ratchet (Canyon Tree Frog) vs a long, musical, high trill (Red-spotted Toad).

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

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