The Common Gliding Lizard (Draco sumatranus) is a lizard with elongated ribs and skin flaps on the sides of its body. When opened, these skin flaps allow it to glide between tree trunks. It is primarily a tree dweller, except that the females come down to the forest floor to lay eggs. The body length is of about 9 cm, with a slightly longer tail. The body is of a dark grey/brown colouration with stripes and patterns to help it camouflage against the tree trunks. The males have a yellow triangular flap of skin under the chin, the gular fold, which is used to communicate with other lizards, mostly for mating. Females have a much smaller and blue flap. They feed on small insects.