The flying squirrel (Glaucomys volans) does not actually fly — it glides. When a squirrel leaps from its perch in a tall tree, it spreads its limbs, stretching out its two patagia (thick, furred membranes that extend from its wrists to its ankles). In this way, a squirrel less than 10 inches long (including a tail almost half that length) can, in a single bound, cover 150 feet or more, gliding through the treetops effortlessly.
Emph. added.
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