The patagium (plural: patagia) is a membranous structure that assists an animal in gliding or flight. ... The patagium that stretches between an animal's hind limbs is called the uropatagium (especially in bats) or the interfemoral membrane.

Which bird can fly with the help of patagium?

Bats. Bats are the only mammals that can fly and sustain their flight. Their arms stretch out into webbed wings made up of a thin membrane or 'patagium' with their fingers on the tips. To fly, they flap their spread-out fingers.

What is a wing membrane?

The wing membrane is an extension of the skin of the body. It is made up of external epidermis and an internal layer of dermis, which contains blood vessels (easily seen in a live bat when the wing is stretched in front of a light) and muscles. These muscles control the curvature of the wing in flight.