Mexican Spadefoot vs. Red-spotted Toad
Both are small grey-brown frogs with red-tipped warts at the same rain pools and stock tanks in southern and eastern Arizona. A: No glands in the Mexican Spadefoot; a small round gland behind each eye in the Red-spotted Toad. B: Vertical, cat-like in the Mexican Spadefoot; horizontal in the Red-spotted Toad. C: Round-bodied in the Mexican Spadefoot; very flat in the Red-spotted Toad. Calls differ: a rasping metallic trill of about a second (Mexican Spadefoot) vs a long, musical trill (Red-spotted Toad).
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