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Great Plains Ground Snake vs. Plains Black-headed Snake

Both are small, plain-bodied snakes of rocky grassland and canyons, found under rocks; they share 51 one-degree squares, including southeastern Colorado. A: No black cap: the head is the colour of the body (banded animals may have a black band across it) in the Great Plains Ground Snake; a sharp black cap that ends in a point 2 to 5 scales behind the head in the Plains Black-headed Snake. B: Oval black saddles, or dark-edged scales in the Great Plains Ground Snake; plain tan, with no marks in the Plains Black-headed Snake. The Plains Black-headed Snake has a pink or orange stripe down the middle of the belly and no loreal scale; the ground snake's belly is whitish.

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Great Plains Ground Snake

Sonora episcopa

Plains Black-headed Snake

Tantilla nigriceps
Great Plains Ground Snake vs. Plains Black-headed Snake: comparison sheet with the differences marked

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

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