This rodent, strictly nocturnal (except on the photo) is called flying squirrel, he lives in North American and forests. They are called that way be cause they have some kind of membrane between their arms and legs that gives them the ability to “fly”, gliding in the air, using their tail to stabilize themselves. There are several other species of flying squirrels in the world.

source : flickr (sidleyvalleyranch) and wikipedia