Tarsius syrichta

Tarsius syrichta
Name	Tarsius syrichta
Status	NT
Status system	IUCN3.1
Genus	Tarsius
Species	syrichta
Authority	(Linnaeus, 1758)

Tarsius syrichta. This small nocturnal primate, commonly known as the Philippine tarsier, is a distinctive species endemic to the southeastern Philippines. It is renowned for its enormous eyes, elongated tarsal bones, and unique vocalizations. The species inhabits the islands of Bohol, Leyte, Samar, and Mindanao, where it plays a specialized role in its forest ecosystem.

Description and morphology

The species possesses one of the largest eye-to-body size ratios of any mammal, an adaptation for its nocturnal lifestyle. Its elongated tarsal bones, from which the genus derives its name, provide powerful leaping abilities. The University of the Philippines has documented its unique auditory bullae, which facilitate exceptional hearing. Distinctive features include a nearly hairless tail used for balance and fingers with adhesive pads, similar to some frogs. Research from the Field Museum of Natural History notes its head can rotate nearly 180 degrees in each direction.

Distribution and habitat

Its range is restricted to specific regions within the Philippines, primarily in the Visayas and parts of Mindanao. Key populations are found in the forests of Bohol, particularly near the Chocolate Hills, and on Samar and Leyte. It favors dense secondary growth, bamboo thickets, and forest edges, often avoiding the interior of primary rainforests. Conservation areas like the Philippine Tarsier and Wildlife Sanctuary on Bohol are critical for its survival. The species' distribution is fragmented due to historical deforestation across the Sulu Sea region.

Behavior and ecology

It is a strictly nocturnal and arboreal creature, spending daylight hours clinging vertically to vines or small trees. Studies by the Smithsonian Institution highlight its solitary nature, with individuals maintaining territories through vocal and scent marking. Its most famous behavior is its silent, powerful leaps between vertical supports to catch prey and avoid predators like Philippine eagles. Communication involves a complex repertoire of calls, with high-frequency sounds used for social contact, documented by researchers at Cornell University.

Diet and feeding

The species is an obligate carnivore, one of the few exclusively meat-eating primates. Its diet consists almost entirely of live animal prey, primarily insects such as beetles, grasshoppers, and moths. It also consumes small vertebrates including lizards, birds, and bats. Hunting occurs at night, utilizing a sit-and-wait strategy before launching a rapid, precise grab with its hands. Analysis of fecal samples by the University of Michigan confirms the absence of plant material in its diet.

Reproduction and life cycle

Females typically give birth to a single offspring after a gestation period of about six months, a long duration for such a small mammal. The infant is born with fur and open eyes, clinging to the mother's belly or she may park it on a branch while foraging. Weaning occurs after approximately two months, and sexual maturity is reached before two years of age. Research from the San Diego Zoo indicates pair bonds may form during the breeding season. Lifespan in the wild is estimated at up to 20 years, though data is limited.

Conservation status and threats

The International Union for Conservation of Nature lists it as Near Threatened, with populations declining. Major threats include extensive habitat loss from logging and conversion to agriculture, particularly for coconut plantations. It is also impacted by the illegal pet trade and accidental killing by domestic animals. Protected areas like the Rajah Sikatuna Protected Landscape on Bohol offer some refuge. Ongoing conservation efforts involve organizations such as the Philippine Department of Environment and Natural Resources and the Primate Conservation, Inc..

Category:Primates of the Philippines Category:Endemic fauna of the Philippines