Chihuahuan Nightsnake vs. Prairie Rattlesnake
Both are blotched snakes with cat-like pupils in southeastern Arizona; nightsnakes coil and strike like small rattlers. A: Thin and pointed, no rattle in the Chihuahuan Nightsnake; a rattle in the Prairie Rattlesnake. B: Flat, barely wider than the neck; no pit in the Chihuahuan Nightsnake; broad and triangular, with a pit in front of the eye in the Prairie Rattlesnake. C: Small dark blotches, a dark collar on the neck in the Chihuahuan Nightsnake; big dark blotches edged pale in the Prairie Rattlesnake. Venomous: leave rattlesnakes alone and give them room.
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