Its geographic range also includes Maripipi Island, Siargao Island, Basilan Island and Dinagat Island. Tarsiers have also been reported in Sarangani, although they may be different subspecies.
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 Tarsius 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.
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. The large membranous ears are mobile, appearing to be almost constantly moving, allowing the tarsier to hear any movement.
Habitat
The Philippine Tarsier's habitat is the second growth, secondary forest, and primary forest from sea level to 700 m (2,300 ft). Its habitat also includes tropical rainforest with dense vegetation and trees that offer it protection like tall grasses, bushes and bamboo shoots. It prefers dense, low-level vegetation in secondary forests, with perching sites averaging 2 meters above the ground.
Home range
Early studies showed that the Philippine Tarsier has a home range of 1 to 2 hectares, but more recent research shows that home ranges averaged 6.45 hectares for males and 2.45 hectares for females (MCP and Kernel 95%), allowing for a density of 16 male and 41 female tarsiers per 100 ha.
Research findings also show that while both male and female tarsiers are solitary animals, they cross each other's paths under the cover of nightfall as they hunt for prey. They travel up to one and a half kilometres across the forest and the optimal area is more than six hectares.
Ecosystem roles
Besides human hunters, feral cats banished from nearby communities are the species' main predators, though some large birds are known to prey on it as well. Because of its nocturnal and arboreal habits, the Philippine Tarsier is most likely to fall prey to owls, or to small carnivores which it can encounter in its canopy homes.
Feeding ecology
The Philippine Tarsier is amberous. Primarily insectivorous, its diet consists of live insects and it has also been observed to feed on spiders, small crustaceans, and small vertebrates such as small lizards and birds. Tarsius syrichta preys on live insects, particularly crickets and grasshoppers. Upon seizing its prey, the tarsier carries it to its mouth using both hands.
As predators, the Philippine Tarsier may help to structure insect communities. To the extent that it is preyed upon by other animals, it may impact predator populations.
Behavior
The Philippine Tarsier is a shy nocturnal animal that leads a mostly hidden life, asleep during the day and only active to look for food during the night. During the day, it sleeps in dark hollows close to the ground, near the trunks of trees and shrubs deep in the impenetrable bushes and forests. They only become active at night, and even then, with their much better sight and amazing ability to maneuver around trees, are very well able to avoid humans.
It is arboreal and is a vertical clinger and leaper,habitually clinging vertically to trees and are capable of leaping from branch to branch.
The Philippine Tarsier is solitary. However, it is found to have either monogamous or polygamous mating system.
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