Anatomy and Morphology
The Philippine tarsier is not a large animal; it measures only about 85 to 160 millimetres (3.35 to 6.30 in) in height, making it one of the smallest primates. The small size makes it difficult to spot. The mass for males is between 80–160 g (2.8–5.6 oz), usually lighter for females, somewhat heavier than other tarsiers such as the pygmy tarsier. The average adult is about the size of a human fist and will fit very comfortably in the human hand (see image below).
Like all tarsiers, the Philippine 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 eyes are disproportionately large, having the largest eye-to-body size ratio of all mammals. These huge eyes provide this nocturnal animal with excellent night vision. In bright light the tarsiers eyes can dilate to until the pupil appears to be only a thin line. In dark light the pupil can fill up almost the entire eye. The large membranous ears are mobile, appearing to be almost constantly moving, allowing the tarsier to hear any movement.
The Philippine tarsier has thin, rough fur which is colored gray to dark brown. The narrow tail, usually used for balance, is naked or bald except for a tuft of hair at the end, and is about twice the body length. Its elongated "tarsus," or ankle bone, which gives the tarsier its name, allows it to jump at least three meters from tree to tree without having to touch the ground. Its long digits are tipped with rounded pads that allow C. syrichta to cling easily to trees and to grip almost any surface. The thumb is not truly opposable, but the first toe is. All of the digits have flattened nails, except for the second and third toes, which have sharp claws specialized for grooming.
The dental formula is, with relatively small upper canines.
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