Sonoran Desert Toad vs. Couch's Spadefoot
Both come out on the first heavy summer rains in the low deserts of southern Arizona and breed in the same rain pools. A: Horizontal oval pupil in the Sonoran Desert Toad; vertical, cat-like pupil in the Couch's Spadefoot. B: Long, kidney-shaped glands in the Sonoran Desert Toad; no big glands behind the eyes in the Couch's Spadefoot. C: Plain olive to brown, smooth in the Sonoran Desert Toad; yellow-green marbled or spotted with black in the Couch's Spadefoot. D: Big glands on the legs; no spade in the Sonoran Desert Toad; no leg glands; a black, sickle-shaped spade under each hind foot in the Couch's Spadefoot.
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