Chihuahuan Black-headed Snake vs. Southwestern Blackhead Snake
Both live under rocks in the oak woodland of the Santa Rita, Patagonia and Huachuca mountains. A: A wide pale collar crossing the tips of the head plates, edged behind by a thin dark line in the Chihuahuan Black-headed Snake; the cap stops at or just behind the big head plates, with no clear pale collar in the Southwestern Blackhead Snake.
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Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.
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