Glossy Swampsnake vs. Plain-bellied Watersnake
Both are plain dark watersnakes of swamps and ditches across the Gulf lowlands and southeastern Oklahoma. A: A small, narrow head barely wider than the neck; yellow lips, each lip scale edged dark in the Glossy Swampsnake; a big, broad head clearly wider than the neck; lips plain or faintly barred in the Plain-bellied Watersnake. B: Yellow with two neat rows of black half-moons down the middle in the Glossy Swampsnake; plain orange or yellow, unmarked in the Plain-bellied Watersnake. C: Glossy olive-brown with two faint dark stripes; small and slim, to about 2 ft in the Glossy Swampsnake; plain brown, grey or olive with no stripes; heavy, to 4 ft in the Plain-bellied Watersnake.
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