Western Threadsnake vs. Southwestern Blackhead Snake

Both are tiny, plain, underground snakes of the rocky desert and grassland of Arizona, out at night after rain. A: No black cap; the head looks like the tail in the Western Threadsnake; a black cap on the head in the Southwestern Blackhead Snake. B: Shiny, pinkish to purplish brown, the same width from end to end in the Western Threadsnake; plain brown, a distinct head and a tapering tail in the Southwestern Blackhead Snake.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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