Arizona Toad vs. Woodhouse's Toad
Both live along streams and rivers of central and western Arizona, and they hybridize where streams have been dammed or altered, so in-between toads turn up. A: None, or only a faint one in the Arizona Toad; a clear whitish stripe down the middle of the back in the Woodhouse's Toad. B: Weak or none in the Arizona Toad; strong crests along the inner edge of the eyes in the Woodhouse's Toad. C: Oval, pale at the front end in the Arizona Toad; long, touching the crests behind the eyes in the Woodhouse's Toad. D: Fairly smooth, low warts, few dark spots in the Arizona Toad; rough, the warts sitting in dark blotches in the Woodhouse's Toad. Calls differ: a long, high, musical trill of 8 to 12 seconds in late winter and spring (Arizona Toad) vs a short, nasal 'waaah' like a bleating lamb (Woodhouse's).
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