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The endangered Northern Flying Squirrel (Glaucomys sabrinus fuscus) is a small nocturnal mammal. Although both species are found in West Virginia, it is larger than the common Southern Flying Squirrel. It weighs between 3.2-5.2 ounces (90-148 grams) and measures 10.25 to 12 inches (260-305 millimeters) in total length. It has a long, broad, flattened tail, large dark eyes and thick, silky fur. The fur is light brown to reddish brown and its belly fur is mostly white. The folds of skin between the ankles and wrists, combined with the broad tail allow the squirrel to glide (not fly) from tree to tree.