Baird's Ratsnake vs. Trans-Pecos Ratsnake
The two ratsnakes of the Big Bend canyons. A: Four faint dark stripes on grey or salmon in the Baird's Ratsnake; dark H-shaped blotches on yellow-olive or tan in the Trans-Pecos Ratsnake. B: Ordinary eye in the Baird's Ratsnake; big, bulging eye ringed by small scales (no lip scale touches it) in the Trans-Pecos Ratsnake.
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Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.
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