Tokay Geckoes are one of the largest geckoes alive today with a length of around 35 cm. The body of a Gekko gecko 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. They also have remains of a rudimentary third eye on the top of their head, which is believed to coordinate their activity to light conditions.
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. Tokay Geckoes have a hearing range from about 300 Hertz to 10,000 Hertz.
They have soft, granular skin that feels velvety to the touch. 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.
In the Gekko gecko, there are obvious male and female differences. The male is more brightly colored than the female and generally, the male is slightly larger than the female. A conspicuous difference between the sexes is the small amount of swelling at the base of the tail of the male, due to the presence of the two hemipenes. Also, the males have visible preanal and femoral pores and postanal tubercules.
Something that is very helpful to the Gekko gecko is their toes that have fine setae on them, allowing them to cling to vertical and over-hanging surfaces and move at fast speeds.
Other Physical Features: Ectothermic; Bilateral symmetry