Plain-bellied watersnake (Okrodia erythrogaster) at the Oklahoma City Zoo.
A grass snake, Natrix natrix, at the Plzen Zoo.
A diamondback water snake (Nerodia rhombifer) at the Chapultepec Zoo, Mexico City, Mexico.
Florida green water snake (Nerodia floridana) at the Archbold Biological Station.
Mississippi green water snake (Nerodia cyclopion) at the Estuarium in Dauphin Island, AL.
A diamondback water snake (Nerodia rhombifer rhombifer) at the Tulsa Zoo.
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