The smooth greensnake (Opheodrys vernalis) is a nonvenomous North American colubrid. It is also referred to as the grass snake. It is a slender, "small medium" snake that measures 36–51 cm (14–20 in) as an adult. It gets its common name from its smooth dorsal scales, as opposed to the rough green snake, which has keeled dorsal scales. It is found in marshes, meadows, open woods, and along stream edges and is native to regions of Canada, Maine, Wisconsin, Illinois, Virginia, Wyoming, Utah, New Mexico, Iowa, Missouri, Colorado, Texas, Michigan and northern Mexico. A non-aggressive snake, it seldom bites and usually flees when threatened. It mates in late spring to summer and females lay their eggs from June to September.