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Mountain Patch-nosed Snake vs. Black-necked Garter Snake

They meet in the hills and mountains of southeastern and east-central Arizona. Both are striped snakes; the garter snake lives near water. A: No black blotches on the neck in the Mountain Patch-nosed Snake; two big black blotches on the neck behind the head in the Black-necked Garter Snake. B: A big patch-like scale over the snout tip in the Mountain Patch-nosed Snake; normal snout; a grey head in the Black-necked Garter Snake. C: Plain pale lips in the Mountain Patch-nosed Snake; black bars on the lips in the Black-necked Garter Snake. Garter snakes have keeled scales; patch-nosed snakes have smooth, shiny scales.

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Mountain Patch-nosed Snake

Salvadora grahamiae

Black-necked Garter Snake

Thamnophis cyrtopsis
Mountain Patch-nosed Snake vs. Black-necked Garter 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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