Big Bend Blackhead Snake vs. Plains Black-headed Snake
They meet in the Trans-Pecos and along the Devils River. A: A broad black hood far down the neck, rounded or straight at the back in the Big Bend Blackhead Snake; a sharp cap ending in a point 2 to 5 scales behind the head in the Plains Black-headed Snake. The Big Bend Blackhead Snake has a dark-smudged chin; the Plains Black-headed Snake has a pinkish belly.
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