Great Plains Ground Snake vs. Chihuahuan Nightsnake
Both are small, night-active, blotched or banded snakes found under rocks; they share 54 one-degree squares, including southeastern Colorado. A: Round in the Great Plains Ground Snake; vertical, like a cat's in the Chihuahuan Nightsnake. B: No dark collar in the Great Plains Ground Snake; big dark blotches forming a collar on the neck in the Chihuahuan Nightsnake. C: Bold black saddles on orange or cream, or plain in the Great Plains Ground Snake; many small dark blotches on grey or tan in the Chihuahuan Nightsnake. The nightsnake has a flat, broad head and is mildly venomous to its prey (harmless to people).
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