Definition:
1. n. A membrane of double-sided skin that forms the wing material in bats. The patagium is an extension of the skin that covers the bat's back and abdomen. It stretches from the sides of the animals to its elongated fingertips forming the surface area that enables them to take flight. Source: Burnie, D. and D.E. Wilson. 'Animal'. Dorling Kindersley. London. 2001.
2. n. A parachute-like membrane that enables some animals (such as lizards and flying lemurs) to glide through the air. Source: Burnie, D. and D.E. Wilson. 'Animal'. Dorling Kindersley. London. 2001.
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