Species Profile

Species Cephalopachus bancanus borneanus
Common Name Western Tarsier (also known as Horsfield's Tarsier)
Family Tarsiidae
Order Primates
Distribution Endemic to Borneo
Habitat This species occurs mainly in lowland primary and secondary forests but is also known to inhabit forest edge and the edge of plantations.
Description  With an average head-body measurement of 12.9-13.2 cm and weighing around 100-119 g, it is one of the smallest primates. The pelage on this subspecies ranges from brown to pale-olive or grayish-brown. Its tail can measure roughly twice its head-body length and is almost completely hairless except for tufts of hair at the end. In addition to having long fingers and widened toe pads, it has two long claws that are used for grooming and marking of territory on its second and third toes of its hind feet. Its unique spinal formation enables it to turn its head nearly 180 degrees in each direction. The tarsi and heel bones are elongated and the leg bones are fused. These are specialized traits that are well adapted for extraordinary leaping abilities. Powerful standing leaps of over 5 m have been recorded in this species.
Notes  Like all tarsiers, it is nocturnal and completely carnivorous, feeding on invertebrates such as grasshoppers, cicadas, cockroaches and phasmids. There have been reports of western tarsiers consuming small vertebrates including bats, birds and snakes. Territorial scent marking is performed by both sexes of this species by using urine and glandular secretions. Vocalization is not as prominent in the Western Tarsier compared to its eastern counterparts of which certain Tarsius species have been observed to perform morning duets. Unlike the eastern tarsiers, this Bornean endemic is the least gregarious and is often found solitary at less than one or two meters off the ground.
Conservation Status  Vulnerable
Crompton, R, Blanchard, M, Coward, S, Alexander, R and Thorpe, S 2010, 'Vertical Clinging and Leaping Revisited: Locomotion and Habitat Use in the Western Tarsier, Tarsius bancanus Explored Via Loglinear Modeling', International Journal of Primatology, vol. 31, issues 6, pp. 958-979.

Gron KJ. 2010 December 1. Primate Factsheets: Tarsier (Tarsius) Behavior . Accessed on 25 May 2014 at http://pin.primate.wisc.edu/factsheets/entry/tarsier/behav

Gron KJ. 2010 December 1. Primate Factsheets: Tarsier (Tarsius) Taxonomy, Morphology, & Ecology . Accessed on 25 May 2014 at http://pin.primate.wisc.edu/factsheets/entry/tarsier/taxon

Shekelle, M. & Yustian, I. 2008. Tarsius bancanus. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. accessed on 25 May 2014 at www.iucnredlist.org
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Sarawak, Malaysia

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Distribution of Cephalopachus bancanus borneanus.

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