Sidewinder vs. Sonoran Lyre Snake
Both are pale, blotched night snakes of the western Arizona deserts; the Lyre Snake's broad head and cat-like pupils make it look like a rattlesnake. A: A raised horn-like scale over each eye in the Sidewinder; no horns; a dark lyre-shaped mark on top of the head in the Sonoran Lyre Snake. B: Heavy, with rough keeled scales in the Sidewinder; slim, with smooth scales; under 30 blotches each split by a pale crossbar in the Sonoran Lyre Snake. The Lyre Snake is rear-fanged with a mild venom, harmless to people. Venomous: leave rattlesnakes alone and give them room.
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