about twice the body length. Its elongated "tarsus", or ankle bone, which gives the tarsier its name, allows it to jump at least 3 m from tree to tree. 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. Ecology The Philippine tarsier is primarily insectivorous, its diet consists of insects, spiders, small crustaceans, and small vertebrates such as small lizards and birds. C. syrichta preys on live insects, particularly crickets and grasshoppers. Upon seizing its prey, the tarsier carries it to its mouth using both hands. Geographic range and habitat The Philippine tarsier, as its name suggests, is endemic to the Philippine archipelago. C. syrichta populations are generally found in the southeastern part of the archipelago. Established populations are present primarily on the islands of Bohol, Samar, Leyte and Mindanao. It has also been found on various isolated islands within its known range, such as Maripipi Island, Siargao Island, Basilan Island and Dinagat Island. The Philippine tarsier's habitat is the second-growth, secondary forest, and primary forest from sea level to . Its habitat also includes tropical rainforest with dense vegetation and trees that offer it protection such as tall grasses, bushes, and bamboo shoots. It prefers dense, low-level vegetation in secondary forests, with perching sites averaging 2 m above the ground. 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 ha for males and 2.45 ha for females , allowing for a density of 16 male and 41 female tarsiers per 100 ha. Both males and females are solitary, but will occasionally cross paths at night. They travel up to 1.5 km across the forest and the optimal area is more than 6 ha. Predators 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