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Definition of FLYING SQUIRREL
: either of two small nocturnal North American squirrels (Glaucomys volans and G. sabrinus) with folds of skin connecting the forelegs and hind legs that enable it to make long gliding leaps; also: any of various squirrels that possess a patagium
North American flying squirrel (Glaucomys).—C.G. Hampson
Any member of two distinct groups of rodents that are able to make gliding leaps by means of parachute-like membranes connecting their forelegs and hind legs on each side. North American and Eurasian flying squirrels, in the squirrel family (Sciuridae), are slender, long-limbed forest dwellers with soft fur and large eyes. They are 3–24 in. (8–60 cm) long, excluding the often-flattened tail, and feed on nuts, fruit, other plant material, and insects. They seldom descend to the ground. They can glide 200 ft (about 60 m) or more from one tree to another. The scaly-tailed flying squirrels of Africa (family Anomaluridae) have rows of scales on the underside of their tufted tail that help them climb and cling to trees. They are similar in appearance and feeding preferences to the sciurids and are about 4–16 in. (10–40 cm) long without the tail.