Glossy Swampsnake vs. Diamondback Watersnake

They share swamps, sloughs and oxbows from southeastern Oklahoma to the Gulf. A: A small, narrow head barely wider than the neck; yellow lips, each lip scale edged dark in the Glossy Swampsnake; a big, broad, flat head much wider than the neck in the Diamondback Watersnake. B: Plain glossy olive-brown, faint stripes only in the Glossy Swampsnake; a dark chain or net of diamonds on a pale back in the Diamondback Watersnake. C: Two neat rows of black half-moons down the middle in the Glossy Swampsnake; yellow with dark half-moons scattered toward the edges in the Diamondback Watersnake. The Diamondback is heavy and grows to 4 ft; the Glossy Swampsnake to about 2 ft.

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

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