There are two sub species of Green Snakes in the United States. The two species are the Smooth Green Snake and the Rough Green Snake. The Smooth Green is a small snake only reaching about 24 inches when full grown. Smooth Green Snakes are not aggressive and rarely bite. When confronted these snakes will retreat. Smooth Green Snake will climb bushes and tress. The main diet of Smooth Green Snakes are insects. Smooth Green Snakes are declining because of the use of pesticides and also because humans are collecting these snakes from the wild for pets.

The Smooth Green Snake is green in color but can range to a yellow color or possibly light grey. These snakes do not have any patterns on them. The belly is yellow or a light cream color.