Rattlesnake roommate. This juvenile eastern diamondback rattlesnake is a recent addition to the North Carolina Aquarium on Roanoke Island, sharing a space with a timber rattlesnake in the Seven Rivers Gallery. The eastern diamondback is one of three species of rattlesnakes native to North Carolina, and is found in the southeast part of the state. They are also the largest of the rattlesnakes; though this diamondback is only a few feet long, they commonly grow to eight feet long in adulthood. The Seven Rivers Gallery at NCARI highlights wildlife found in and around the Albemarle sound, including snakes, alligators, fish, frogs and turtles.