Smooth Greensnake (Opheodrys vernalis) – Amphibians and Reptiles of Iowa
Canadian Herpetological Society
Maryland Biodiversity Project - Smooth Greensnake (Opheodrys vernalis)
Smooth Green Snake stock image. Image of biology, cryptic - 112682605
Kansas Herpetofaunal Atlas
Kankakee-locality Bullsnake and other finds from Indiana/Illinois : r/snakes
Canadian Herpetological Society
Smooth Green Snake Museum of Natural History
Ohio Birds and Biodiversity: A blue green snake
Wild Profile: Meet the smooth green snake - Cottage Life
Kansas Herpetofaunal Atlas
smooth green snake –