Yaqui Black-headed Snake vs. Plains Black-headed Snake
Both live in the grassland and foothills of far southeastern Arizona. A: The cap ends square, followed by a thin white collar in the Yaqui Black-headed Snake; the cap ends in a point well behind the head plates; no pale collar in the Plains Black-headed Snake. The Plains Black-headed Snake also has a red or pink stripe down the middle of the belly.
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