Mexican Spadefoot vs. Couch's Spadefoot
Both breed in the same summer rain pools across southeastern and central Arizona. A: Brown, grey-green or grey-brown with dark spots and red-tipped warts in the Mexican Spadefoot; bright green to yellow-green, marbled or spotted with black in the Couch's Spadefoot. B: Short and wedge-shaped in the Mexican Spadefoot; long and sickle-shaped in the Couch's Spadefoot. C: Smaller: to 2.5 in (6.4 cm) in the Mexican Spadefoot; larger: to 3.5 in (9 cm) in the Couch's Spadefoot. Calls differ: a rasping metallic trill of about a second (Mexican) vs a bleat like a goat's (Couch's).
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