Ridge-nosed Rattlesnake vs. Sidewinder
Their ranges only touch at the edges; the Sidewinder lives on low sandy desert, the Ridge-nosed in mountain canyons. A: A raised rim of upturned scales round the tip of the snout in the Ridge-nosed Rattlesnake; a horn-like scale over each eye; no rim on the snout in the Sidewinder. B: Pale crossbars edged dark in the Ridge-nosed Rattlesnake; pale, sandy, with faint blotches in the Sidewinder. Both Ridge-nosed and Twin-spotted Rattlesnakes are protected in Arizona. Venomous: leave rattlesnakes alone and give them room.
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