These common snakes use their coloration to hide from predators and often freeze in place when approached.
Wild Profile: Meet the smooth green snake - Cottage Life
Canadian Herpetological Society
Smooth Green Snake
Smooth Greensnake (Opheodrys vernalis) - Indiana Herp Atlas
Smooth Greensnake
Smooth Green Snake - Facts, Diet, Habitat & Pictures on
Opheodrys vernalis – Smooth Greensnake
Smooth Green Snake Museum of Natural History
A Guide to Caring for Pet Green Snakes