The rough green snake is a pretty neat critter. It's not particularly big, but as far as snakes go, it can be pretty cute. It's emerald green because it's favorite place to hang out is in the tree tops. In late spring, the females nest in tree cavities, and will use the same spot year after year if it stay unoccupied.
This snake lives off of spiders mostly, but the occasional katydid, dragonfly, or appropriately sized tree frog can be quite the delectable treat. Green snakes are incredibly flexible, a trait that comes in quite useful when your snakey life depends on not plummeting 60 ft out of a hickory tree. You can see in the photo above just how adapted the rough green snake is to tree top life as I transfer it from a stick onto an oak sapling.