Why do flying squrirrels have flaps of long fur-less skin between their front and back legs?

Flying squirrels have flaps of skin, known as patagia, between their front and back legs to aid in gliding. These flaps increase their surface area, allowing them to catch air and glide between trees efficiently. This adaptation helps them escape predators and navigate their forest habitats more easily. The fur-less skin also reduces weight and drag during their gliding movements.