Ptyas mucosus, also known as the oriental rat snake or Indian rat snake, is a non-venomous species of colubrid snake found in Asia. The snake is characterized by its slender, elongated body, and glossy, smooth skin. Synonyms for ptyas mucosus include Ptyas carinata, Ptyas erythrogenys, Coluber mucosus, Coluber carinatus, and Coluber erythrogenys. These synonyms are used to refer to the same species of snake, but with varying taxonomic classifications. The oriental rat snake is a common and important predator of rats, mice, and other small mammals in its native range. It is also sometimes kept as a pet due to its attractive appearance and docile temperament.