Concho Watersnake vs. Diamondback Watersnake

Both live along the Colorado and Concho rivers and their reservoirs. A: Small, separate dark spots in four rows in the Concho Watersnake; a dark chain-like net of diamonds over the back in the Diamondback Watersnake. B: Small and slim: 14 to 32 in in the Concho Watersnake; big and heavy: to 48 in or more in the Diamondback Watersnake. The Diamondback Watersnake's belly has dark half-moons; the Concho's is plain.

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

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