Glossy Swampsnake vs. Graham's Crawfish Snake

The two crayfish snakes of Oklahoma; both are plain brown, burrow in muddy pond and ditch edges and eat crayfish. They share 26 one-degree squares in Oklahoma, Arkansas, Louisiana and Texas. A: Two neat rows of black half-moons down the middle in the Glossy Swampsnake; plain yellow; a dark line along each edge, at most a faint middle row of dots in the Graham's Crawfish Snake. B: Olive-brown down to a pale yellowish belly edge; no broad stripe in the Glossy Swampsnake; a broad yellowish stripe on the lowest three rows of side scales, edged by a dark line in the Graham's Crawfish Snake.

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

More comparisons

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