Tarsier

Its huge eyes are what make it unforgettable: each is about 16 mm across, as big as the animal's whole brain or even bigger. Tarsiers are small primates, with a body of 10–15 cm, that live in the forests of Indonesia, Malaysia, the Philippines and Brunei and can turn their heads 180 degrees in each direction. They are the only primates that eat nothing but animal food, mostly insects, which they catch by leaping on them.