Robuta

https://www.animaldiversity.org/accounts/Nerodia_sipedon/

Nerodia sipedon (Northern Water Snake) | INFORMATION | Animal Diversity Web

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https://www.animaldiversity.org/accounts/Nerodia_sipedon_pleuralis/classification/

Nerodia sipedon pleuralis | CLASSIFICATION | Animal Diversity Web

nerodia sipedon pleuralis animal diversity web classification

https://www.animaldiversity.org/accounts/Nerodia_sipedon_insularum/classification/

Nerodia sipedon insularum | CLASSIFICATION | Animal Diversity Web

nerodia sipedon insularum animal diversity web classification