Minnesota Seasons - smooth greensnake
Opheodrys vernalis The Reptile Database
Colorado Parks & Wildlife - Species Profiles
Smooth Greensnake – PA HERP IDENTIFICATION
Photos of Smooth Greensnake (Opheodrys vernalis) · iNaturalist
Smooth Greensnake (Opheodrys vernalis) - Indiana Herp Atlas
Maryland Biodiversity - View Thumbnails - Abbotts Sphinx ( Manitoba Herps Atlas - Snakes (Colubridae, Natricidae and Smooth Greensnake (Amphibians & Reptiles of Cuyahoga Valley Amphibian and Reptile Species List – rare Charitable Research Reserve