- rat snake - any of various nonvenomous rodent-eating snakes of North America and Asia
--1 is a kind of colubrid snake, colubrid
--1 has particulars:corn snake, red rat snake, Elaphe guttata; black rat snake, blacksnake, pilot blacksnake, mountain blacksnake, Elaphe obsoleta; chicken snake; Indian rat snake, Ptyas mucosus