The large eyes allow for excellent vision, which the colugo uses to accurately jump and glide from tree to tree.[6] It has an avascular retina which is not typical of mammals, suggesting this is a primitive trait; on par with other nocturnal mammals, specifically nocturnal primates, the rod cells in the eye make up about 95-99% of the photoreceptors and cones make up about 1-5%.[3] Its clawed feet are large and sharp with an incredible grip strength, allowing them to skillfully but slowly climb trees, hang from branches, or anchor themselves to the trunk of a tree.[6] One unique feature of the colugo is the patagium, the weblike membrane that connects its limbs to allow for gliding. Unlike other mammals with patagia, its patagium extends from the neck to the limbs, in between digits, and even behind the hind limbs and the tail.