Chihuahuan Hook-nosed Snake vs. Mexican Hognose Snake

Both are small, upturned-snouted snakes of the grassland valleys of southeastern Arizona. A: Many thin, zigzag brown bars in the Chihuahuan Hook-nosed Snake; big dark blotches down the back in the Mexican Hognose Snake. B: Smooth and shiny in the Chihuahuan Hook-nosed Snake; keeled (a ridge on each scale); a sharply upturned, keeled snout in the Mexican Hognose Snake. The Mexican Hognose is much heavier and has a black belly; the hook-nosed snake's belly is pale or pink.

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

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