Largest mammal eyes (relative to body size)

The Philippine tarsier (Carlito syrichta; formerly Tarsius syrichta) is one of the world's smallest primates and lives in the forests of Borneo, Sumatra and the Philippines. They have a head and body length of 85–160 mm (3.3–6.3 in) and tail of 135–275 mm (5.3–10.8 in), and yet their large forward-pointing eyes have a diameter of 16 mm (0.6 in). Indeed, their eyes are so enormous that proportionately they would be equivalent to grapefruit-sized eyeballs in a human being!

These tarsiers are confined to the islands of Bohol, Samar, Leyte and parts of Mindanao and feed mainly on insects. They are an endangered species, falling victim to deforestation and poachers who sell them as pets (although they rarely live long in captivity).

They are the only primates along with animals from the Galago genus, able to turn their heads through 180 degrees in each direction.

Tarsiers also have the highest infant-weight 25-27g (0.8-0.9 oz) to maternal-weight 80-150 g (2.8-5.3oz) ratio of any primate that gives birth to a single infant - 1:6.