The tarsier is a highly specialized primate with a small size. The body of the tarsier is only 9-16 cm, the body length is 85-160 mm, the tail length is 130-270 mm, and the weight is 80-165 grams. It is a very small primate. The back hair is soft and grey with a silver sheen, and the belly is light grey. The head is round, the snout and neck are plated, the ear shells are thin and hairless, and the eyes are very large, up to 16 mm in diameter. The forelimbs are short, the hindlimbs are long, and the toes have rounded suction cups that can stay on many smooth surfaces. The head is large and round, the eyes are extra large, the face is forward, and the orbital septum is thin. The eye is adapted for night vision, and the retina has no cones. Short neck, characteristic of many jumping taxa.

Tars

Except for second and third The toes have claws, and the other fingers and toes have flat nails. The hind limbs are long, the embryonic bone and the scapular bone are fused, and the attached bone is special, so it is called the attached monkey. The tail is slender and hairy at the end.

The tarsier's head can turn 180°, so it has a very wide field of view. They have a plate-shaped pad at the end of their toes, which allows them to cling firmly to branches.

The tarsier also has a tail that almost doubles as its body, which acts as a balance and support.

Because of this tail, the tarsier can not only jump between the branches accurately, but also can lie on the branches stably without falling off.

With a short face, a short, pointed mouth and large canine teeth, each eye of a tarsier weighs 3 grams, which is heavier than its brain. Tarsier monkeys are so sensitive to danger that they keep one eye open even when resting. The large eyes of tarsiers are very suitable for night hunting. They eat insects, frogs, lizards and birds. One species of tarsier is also capable of preying on birds and venomous snakes larger than themselves. The tarsier is about the size of a large mouse, with a yellowish-brown body, and at first glance it looks like a brown house mouse.

According to the proportion of the body, the tarsier has the largest eyes, the largest ears and the longest phalanges among the primates.

Their two membranous ears are also very large, flapping from time to time, so their hearing is very sensitive, as long as there is a little movement around them, they can detect it. Strangely, when the tarsier sleeps, its two large ears fold up at will, blocking out the sound of the outside world.