In Gliding species, such as some Lizards , Rodents , and Primates , the flat Parachute -like extension of skin that catches the air, allowing them to glide.
In some Lepidopterans , one of a pair of small sensory organs situated at the bases of the anterior wings.
In Birds , the fold of skin extending from the Humerus to the Carpal Joint , making up the leading edge of the wing.
