Big Bend Patch-nosed Snake vs. Sonoran Whipsnake
They meet in the valleys and foothills of southeastern and south-central Arizona. Both are slim, fast snakes with big eyes. A: A big patch-like scale over the snout tip in the Big Bend Patch-nosed Snake; normal, rounded snout in the Sonoran Whipsnake. B: A pale stripe down the middle between two wide dark stripes in the Big Bend Patch-nosed Snake; plain grey, olive or bluish, no dark stripes down the back in the Sonoran Whipsnake. C: Wide dark stripes along the upper sides in the Big Bend Patch-nosed Snake; two or three thin pale stripes along the front of each side, fading towards the tail in the Sonoran Whipsnake.
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