The body of a tokay is cylindrical, squat, and somewhat flattened on the upper side. The limbs are well-defined and uniformly developed. The head is large and set off from the neck, and they have large, prominent eyes with vertically-slit pupils. The eyelids of these animals are fused together and transparent. The ears can be seen on the outside of the gecko as small holes on both sides of the head. It is possible to see straight through the head of these geckoes through their ears. The skin is usually gray with several brownish-red to bright red spots and flecks. The male is more brightly colored than the female and generally slightly larger than the female. The coloration of a tokay gecko is very important to its lifestyle. The skin is usually gray with several brownish-red to bright red spots and flecks but it has the ability to lighten or darken the coloring of its skin. They usually do so in order to blend in or to be less noticeable to other animals. They have folds of skin that prevent the animal from casting a shadow while resting on a tree. They open up the skin fold completely and this allows them to blend in with the tree bark. An important characteristic of the tokay gecko is its ability to cast off its tail in defense and regenerate a new one. The part of the tail that has been cast off continues to move violently for several minutes until it slows down and stops, thus giving the gecko time to escape.