Tamaulipan Milksnake vs. Western Milksnake
Long one species (the Milksnake), split on genetics in 2014: they meet around the southern Edwards Plateau and San Antonio. A: Head and snout jet black back to behind the eyes: a solid dark face mask in the Tamaulipan Milksnake; snout mottled or flecked with white or pale scales; rarely a solid black mask in the Western Milksnake. B: Broad, unbroken red rings, 2 to 4 times wider than the black rings beside them in the Tamaulipan Milksnake; narrower red rings, often no wider or only a little wider than the black rings in the Western Milksnake. Many snakes near where they meet are hard to place: the range decides.
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Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.
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