Tarsius syrichta fraterculus (“magau”) by α is for äpΩL † on Flickr.

The Philippine Tarsier has been called “the world’s smallest monkey” or “smallest primate” by locals before. However, the Philippine Tarsier is neither a monkey nor the smallest primate. It is related to other primates, including monkeys, lemurs, gorillas and humans but it occupies a small evolutionary branch between the strepsirrhine prosimians, and the haplorrhine simians.

Tarsier’s eyes are fixed in its skull; they cannot turn in their sockets. Instead, a special adaptation in the neck allows its round head to be rotated 180 degrees. The large membranous ears are mobile, appearing to be almost constantly moving, allowing the tarsier to hear any movement. It has uniquely large eyes (disproportionate to its head and body), which are listed in the Guinness Book of Records as the largest eyes on any mammal. These huge eyes provide this nocturnal animal with excellent night vision

(Source: animalgazing)