Life span: >16 years
Total population: Unknown
Regions: Brunei, Indonesia, Malaysia, Philippines
Gestation: 157 to 193 days (5.2 to 6.3 months)
Height: 9.7 cm to 13.2 cm (M & F)
Weight: 57.5 to 153 g (M & F)
Species: T. bancanus, T. dentatus, T. lariang, T. pelengensis, T. pumilus, T. sangirensis, T. syrichta, T. tarsier, T. tumpura, T. wallacei
Subspecies: T. b. bancanus, T. b. borneanus, T. b. saltator
Other names: T. bancanus: Horsfield's tarsier, western tarsier;
tarsier de Bornéo (French); västligt spökdjur (Swedish); T. b.
borneanus: Bornean tarsier; T. b. saltator: Belitung Island tarsier; T.
dentatus: T. dianae, Dian's tarsier, Diana tarsier; T. lariang: Lariang
tarsier; T. pelengensis: Peleng tarsier, Peleng Island tarsier; T.
pumilus: Lesser spectral tarsier, pygmy tarsier, mountain tarsier; tarsero
piemeno (Spanish); dvärgspökdjur (Swedish); T. sangirensis: Sagihe
Island tarsier, Sangihe tarsier; T. syrichta: Philippine tarsier,
Phillipine tarsier; tarsier des Philippines (French); filippinskt spökdjur
(Swedish); T. tarsier: T. spectrum, Eastern tarsier, spectral tarsier,
Sulawesi tarsier; tarsier des Célèbes (French); östligt
spökdjur (Swedish); T. tumpara: Siau Island tarsier.
The taxonomy of the tarsiers is debated and some authors include more forms
that are not included here (see Brandon-Jones et al. 2004). Groves (2005)
recognizes 7 species of tarsier, with only T. bancanus separated at the
subspecific level. Here, the taxonomy of Groves is followed, and includes the
recently described T. lariang as a full species as per Merker &
Groves (2006). Very little is known about some of the tarsier species,
especially T. pumilus, which had been known from only three museum
specimens until the recent rediscovery of a wild population (Musser & Dagosto
1987; Shekelle 2003; Gursky-Doyen & Grow 2009; in review). Further, there is
some debate as to the proper Latin name of the spectral tarsier (see Gursky
2007a). Much of the literature on spectral tarsiers refers to the species as T.
spectrum, and many researchers continue to do so (e.g. Gursky 2007a), but here
T. tarsier is used as per Groves (2005). The tarsier population on Siau Island,
Indonesia, which has been recognized as specifically distinct, has been recently
named T. tumpara (Mittermeier et al. 2007; Shekelle et al. 2008). In 2010, Merker et al. described
a new species of tarsier located in central Sulawesi, T. wallacei (Merker et al. 2010).
Photo: David Haring
In general, tarsiers are among the smallest of the prosimians, and are
relatively hard to distinguish from one another purely on differences in pelage
(Musser & Dagosto 1987; Ankel-Simons 2007). At the basic level, most of the
pelage is grey with some, or some combination of, red, brown, yellow, orange, or
buff (Niemitz 1979; 1984). The ends of the hairs can be dark red, brownish, or
black with a grey base (Niemitz 1979; 1984). Further, there is often
significant inter- and intra-specific overlap as well as variation in pelage by
population and geographic location such that coloration is not a reliable
indicator to distinguish all species from one another (Niemitz 1979; 1984).
However, there are some distinct differences between the species in coloration.
T. tarsier for example, has white spots behind its ears and a scaly
underside of the tail, traits which the other species do not possess (Musser
& Dagosto 1987; Groves 1998). Further, T. bancanus and T.
syrichta have more yellow and a more pale coloration than T.
tarsier (Musser & Dagosto 1987).
Among the species, the amount of tail hair is variable, decreasing from the
hairiest tails found on the Sulawesi tarsiers (T. tarsier, T.
pumilus, and T. dianae) to the intermediate T. bancanus,
to the least hairy tail possessed by T. syrichta which is usually
considered naked (Musser & Dagosto 1987; Gursky 2007a). Other means by
which the species are, in varying degrees, determined from one another include
eye size, dentition, and limb proportions (Gursky 2007a). T. pumilus
is easily distinguished by its diminutive body size relative to the other
species of tarsier whose body sizes often overlap with one another (Musser &
Dagosto 1987; Maryanto & Yani 2004).
Head and body lengths of adults average 12.9-13.2 cm (5.1-5.2 in) (T.
bancanus), 11.4-12.5 cm (4.5-4.9 in) (T. bancanus saltator), 11.8
cm (4.6 in) (T. dentatus), 9.7 cm (3.8 in) (T. pumilus),
12.4-12.8 cm (4.9-5.0 in) (T. tarsier) and 11.7-12.7 cm (4.6-5.0 in)
(T. syrichta) (Niemitz 1984e; Musser & Dagosto 1987; Niemitz et al.
1991; Yustian 2007). However, in one wild study, average head and body lengths
for spectral tarsiers (T. tarsier) were significantly higher at 24.3 cm
(9.6 in) (male) and 23.0 cm (9.1 in) (female) (Gursky 2007a). The tail is
roughly twice the head and body length (Shekelle 2003). Several species of
tarsiers are sexually dimorphic, with males larger in body size than females
(Neri-Arboleda et al. 2002; Gursky 2007a). Recorded adult body weight ranges
including non-pregnant females are 104-135 g (3.7-4.8 oz) (M) and 95-110 g
(3.4-3.9 oz) (F) (T. dentatus), 150 g (5.3 oz) (M) and 143 g (5.0 oz)
(F) (T. sangirensis), 119-153 g (4.2-5.4 oz) (M) and 110-132 g (3.9-4.7
oz) (F) (T. syrichta), 67-112 g (2.4-4.0 oz) (M) and 72-109 g (2.5-3.8
oz) (F) (T. lariang), 110-138.5 g (3.9-4.9 oz) (M) and 100-119 g
(3.9-4.2 oz) (F) (T. bancanus borneanus), 121.4-123.0 g (4.28-4.33 oz)
(M) and 101.2-108.5 g (3.6-3.8 oz) (F) (T. bancanus saltator), 104-132
g (3.7-4.7 oz) (M) and 94-119 g (3.3-4.2 oz) (F) (T. tarsier), and
48.1-50.1 g (1.7-1.8 oz) (M) and 52.0-57.5 g (1.8-2.0 oz) (F) (T.
pumilus) (Rickart et al. 1993; data compiled by
Shekelle 2003; Maryanto & Yani 2004; Merker & Groves 2006; Yustian
2007; Grow and Gursky in press).
Photo: Stefan Merker
Unique spinal morphology makes tarsiers capable of turning their heads nearly
180° in each direction, allowing them the ability to rotate their heads
almost 360° (Ankel-Simons & Simons 2003; Ankel-Simons 2007). All
tarsiers have claws on the second and third digits, two grooming claws on their
feet, and pads on each of their fingers (Ankel-Simons 2007). Several bones of
the heel (tarsals) are longer than those of any of the primates, and the genus
name Tarsius partially describes this trait (Ankel-Simons 2007). Further, the
amount of fur on the heel can be used to distinguish some tarsiers from one
another. For example, while the heels of most tarsiers are fully furred, T.
syrichta heels have very little, sparse, fine hair only, giving the
appearance of being hairless in contrast to the rest of the body (Musser &
Dagosto 1987: Ankel-Simons 2007). The nose is dry (Ankel-Simons 2007).
Tarsiers move through their environment predominantly, but not exclusively,
through leaping (MacKinnon & MacKinnon 1980; Niemitz 1985; Crompton &
Andau 1986; Dagosto et al. 2001; Gursky 2007a). The tarsier body is well
adapted for leaping. In addition to the unique heel morphology, the legs and
their muscles comprise around a quarter of the weight of the entire body
(Niemitz 1985). Due to their morphology, tarsiers are capable of leaping quite
far, with T. bancanus able to leap over 5 m (16.4 feet) (Niemitz 1983).
Other forms of locomotion include bipedal and quadrupedal climbing, quadrupedal
walking, clambering and hopping (MacKinnon & MacKinnon 1980; Niemitz 1984c;
Crompton & Andau 1986; Dagosto et al. 2001). The proportions of different
locomotor activity differ with species however, and in some cases sets species
apart from one another (Dagosto et al. 2001). Furthermore, locomotion in the
wild is extremely quiet (MacKinnon & MacKinnon 1980).
The oldest living captive tarsier was over 16 years old when it died (Weigl
CURRENT RANGE MAPS (IUCN REDLIST):Tarsius bancanus
| Tarsius dentatus
| Tarsius lariang
| Tarsius pelengensis
| Tarsius pumilus
| Tarsius sangirensis
| Tarsius syrichta
| Tarsius tarsier
Tarsiers are restricted to the Southeast Asian island nations of Brunei,
Indonesia, Malaysia, and the Philippines (Shekelle et al. 1997; Brandon-Jones et
al. 2004). On morphological grounds, the tarsiers are often divided into two
geographic groups; a Philippine-Western group and an Eastern group
(Brandon-Jones et al. 2004). T. syrichta is restricted to the
Philippines; found on the southern islands of Bohol, Dinagat, Leyte, Mindanao,
Samar, and Siargao (Gursky 1999). The range of T. bancanus stretches
between and includes southern Sumatra and Borneo, including the islands of
Bangka, Belitung and Karimata (midway between Sumatra and Borneo), as well as
Serasan (just off the northwest coast of Borneo) (Gursky 1999).
Subspecifically, T. b. bancanus is found on Sumatra, from the Musi
River to the Sunda Strait. T. b. borneanus is found throughout the
island of Borneo. T. b. saltator is found on Belitung Island
(Brandon-Jones 2004). East of Borneo, several species of tarsier call the
island of Sulawesi home, including T. dentatus, T. lariang,
T. pumilus, and T. tarsier (Gursky 1999; Merker & Groves
2006). T. pumilus is restricted to the central Sulawesian montane
mossy cloud forests (Simons 1987; Shekelle et al. 1997; Maryanto & Yani
The distribution of T. lariang, while only tentatively established, is
suspected to encompass west-central Sulawesi (Merker & Groves 2006). T.
dentatus is found in central Sulawesi (Niemitz et al. 1991; Shekelle et al.
1997; Gursky 1999). T. sangirensis is restricted to the Greater Sangihe
Island, north of Sulawesi (Shekelle et al. 1997; Groves 1998). T. tumpara is
found only on Siau Island, part of the Sangihe Island chain (Shekelle et al.
2008). The spectral tarsier (T. tarsier) is reported from Sulawesi and some surrounding
islands (Niemitz 1984e; Musser & Dagosto 1987). However, as more tarsier
diversity is recognized on Sulawesi, the range of T. tarsier continues
to shrink, and the species may only be found in northern Sulawesi (Gursky 1998).
T. pelengensis is found on Peleng Island off of the east coast of
Sulawesi (Shekelle et al. 1997).
Population totals in the wild are unknown, however population density surveys
have revealed tarsiers live in medium to low densities. The Siau Island tarsier
is listed as one of the World's 25 Most Endangered Primates, and at most,
likely numbers only one thousand or a few thousand individuals (Mittermeier et
al. 2007; Shekelle et al. 2008). On mainland Sulawesi, a population density
survey of spectral tarsiers sampled 156 individuals per square kilometer (Gursky
1998). T. dianae population density can reach 268 individuals per square
kilometer in less disturbed habitat, but drops to 45 in habitats heavily
disturbed by human activity (Merker et al. 2005). In the Philippines, T.
syrichta lives at 57 individuals per square kilometer in fragmented forest
(Neri-Arboleda et al. 2002). Based on low trapping success rates, T. pumilus is
thought to live at an extremely low density (Gursky-Doyen & Grown 2009).
Tarsiers are found in a broad variety of habitats, including primary and
secondary habitats, as well as certain habitats under human cultivation or use
(MacKinnon & MacKinnon 1980; Crompton & Andau 1986; Yustian et al.
2008). Habitats in which tarsiers have been found include primary, secondary,
mossy, microphyll, montane, bush, gallery, deciduous rain, and mangrove forests;
thorn scrub, shrubland, swamps, riverine, palm, and bamboo habitats, seashore
scrub, and even urban gardens, villages and grassland (MacKinnon & MacKinnon
1980; Crompton & Andau 1986; Leksono et al. 1997; Neri-Arboleda et al. 2002;
Riley 2002; Maryanto & Yani 2004; Gursky 2007a). However, grassland is
usually used only to travel between other suitable habitats (Neri-Arboleda et
al. 2002). Secondary habitats in which tarsiers can be found include those
which have been selectively and intensively logged; those containing coffee,
nutmeg, coconut or coca plantations; areas being cut for bamboo and rattan
extraction, and forests in which intensive or small-scale agricultural
activities are taking place (Riley 2002; Merker 2006; Yustian et al. 2008). If
found in secondary, degraded, or habitats under human use, tarsiers require at
least the presence of some suitable dense shrubs, forest remnants or bamboo
stands to provide the proper sleeping sites (Leksono et al. 1997; Merker &
Yustian 2008). In addition, population densities are lower in more disturbed
habitats (Merker 2003). Tarsiers can range from sea level to as high as 1500 m
(4921.3 ft), with the exception of T. pumilus, which can be found as
high as 2200 m (7217.8 ft) (MacKinnon & MacKinnon 1980; Shekelle 2003;
Maryanto & Yani 2004).
At one long term study site near the Lore-Lindu National Park on Sulawesi, an
average of 270 cm (106.3 in) of rain falls annually. The temperature varies
little over the course of the year, but temperatures average highs of 32.9°C
(91.2°F) during the day and lows of 19.5°C (67.1°F) at night (Merker
2003 cited in Merker 2006). In northern Borneo at the Sepilok Forest Reserve,
there are two seasonal monsoons (December-January and July) during which much of
the annual 314.7 cm (123.9 in) of rain falls. At this site the temperature
averages 26.7°C (80°F) (Crompton & Andau 1987).
Photo: David Haring
Tarsiers eat only prey and are the only entirely carnivorous primates,
consuming no plant matter whatsoever (Fogden 1974; Niemitz 1984d; Jablonski
& Crompton 1994; Gursky 2007b). However, there are differences among the
tarsiers in the types of animal matter that are consumed as well as seasonal
changes in consumption. For example, T. bancanus eat arthropods
mostly, including beetles, cockroaches, grasshoppers, butterflies, phasmids and
cicadas. This species will also eat small birds, and other prey such as bats,
frogs, freshwater crabs and snakes (Niemitz 1973; 1979; Jablonski & Crompton
1994). Contrary to this, T. tarsier has not been seen to eat birds,
snakes, or other prey, but is the most insectivorous of the primates, eating
exclusively arthropods, including spiders, beetles, termites, cicadas, ants,
moths, caterpillars, katydids, crickets, grasshoppers, cockroaches and
walkingsticks (MacKinnon & MacKinnon 1980; Gursky 2000b; 2007). T.
syrichta consumes similar foods, including orthopterans, lepidopterans,
beetles, ants, and termites (Dagosto et al. 2003). Further, there are seasonal
shifts in the types of prey consumed as well as in the locations of the
procurement of prey between the dry and wet seasons in T. tarsier
(Gursky 2000b). The diets of T. syrichta and T. pumilus are
unknown (Gursky 2007b).
T. tarsier procures its prey directly from the air (34.8%), the
ground (7.8%), from leaves (46.3%) and from branches (11.1%) (Gursky 2000b). In
captivity, T. bancanus used three main methods of capturing prey with
an overall 88% success rate; reaching out and grabbing prey without moving,
leaping onto prey, or leaping several times towards and then onto potential prey
(Roberts & Kohn 1993).
Estimated home range averages are 0.006-0.065 km² (0.002-0.03 mi²) (T.
syrichta), 0.023-0.031 km² (0.009-0.01 mi²) (T. tarsier),
0.005-0.018 km² (0.002-0.005 mi²) (T. dentatus), 0.045-0.1125 km²
(0.02-.04 mi²) (T. bancanus), 0.023-0.103 km² (0.009-0.04 mi²) (T.
bancanus saltator) (Crompton & Andau 1986; 1987 Tremble et al. 1993;
Dagosto et al. 2001; Neri-Arboleda et al. 2002; Dagosto et al. 2003; Merker
2006; Gursky 2007a; Yustian 2007). Mean nightly path distances for T.
tarsier average 476.0 m (1561.7 ft) for females and 782.9 m (2568.6 ft) for
males (Gursky 2007a). T. bancanus travels an average of 1800 m (5905.5
ft) nightly and T. bancanus saltator travels between 768 and 1061 m
(2519.7 and 3481.0 ft) per night on average (Crompton & Andau 1986;
Neri-Arboleda et al. 2002; Yustian 2007). T. syrichta travels an
average of 1119 m (3671.3 ft) (F) and 1636 m (5367.5 ft) (M) per night
(Neri-Arboleda et al. 2002). Home ranges increase in size with degree of human
disturbance and degradation (Merker 2006). In T. syrichta and T.
bancanus, home ranges overlap with individuals of the opposite sex, but
only to a small degree with individuals of the same sex (Fogden 1974;
Neri-Arboleda et al. 2002).
Tarsiers are nocturnal. T. bancanus usually awakes before sunset
and does not retire for the night until after sunrise (Niemitz 1984a). There
are peaks in leaping and movement in T. bancanus early and late in the
night, a pattern also followed by T. dentatus (Crompton & Andau
1987; Merker 2006). As the hour of night progresses, the height of activities
decreases (Crompton & Andau 1987). Spectral tarsiers (T. tarsier)
spend their time foraging (55%), followed by traveling (23%), resting (16%) and
in social activities (6%) (Gursky 2005a; 2007a). Spectral tarsiers (T.
tarsier) alter their activity patterns between the wet and dry seasons. In
the dry season, when resources are less available, travel distance and home
range are expanded, resulting in increased numbers of intergroup encounters. In
addition, time spent in social activities is shortened in the dry season, and a
dietary shift is seen to smaller insect prey, as well as ground-dwelling
varieties (Gursky 2000b). Further, spectral tarsiers (T. tarsier) are
more active during full moons (Gursky 2003a).
Tarsiers are most often found less than one or two meters (3.3 or 6.6 feet)
above the ground (Crompton & Andau 1986; Tremble et al. 1993; Dagosto &
Potential predators of tarsiers include civets, arboreal snakes, monitor
lizards, and raptors including owls (Gursky 1997; Jachowski & Pizzaras 2005;
Gursky 2002c). Feral cats are also predators of tarsiers (MacKinnon &
MacKinnon 1980; Jachowski & Pizzaras 2005). Among wild spectral tarsiers
(T. tarsier), if a snake threat is identified, all members of a group
will travel towards the predator and will mob it, lunging, vocalizing, and even
biting the threat (Gursky 2002b; 2002c). Interestingly, while spectral tarsier
groups do not contain more than one adult male, during the mobbing of a
predator, often more than one adult male is present, indicating the presence of
males from more than one group (Gursky 2002c; 2005b; 2006).
Sleeping sites of T. syrichta are typically dense tangles of
vegetation near large trees and close to the ground and each tarsier normally
uses several (3-4), each located near the edges of its range (Dagosto et al.
2003). In a semi-wild environment, sleeping sites in the species are usually
around 2 m (6.6 ft) off the ground (Jachowski & Pizzaras 2005).
Contrastingly, both T. dentatus and T. tarsier usually use
only one sleeping site and rarely two or three, but they are also located near
the edges of the home range (Merker 2006; Gursky 2007). T. dentatus
prefers dense vegetation or tree cavities for sleeping (Tremble et al. 1993).
T. bancanus sleeps in vegetation tangles between 3.5 to 5 m (11.5 to
16.4 ft) off the ground (Crompton & Andau 1986). T. sangirensis
sleeps on exposed bamboo, the tops of palm leaves, or at the tops of trees,
unlike all other species of tarsier (Shekelle et al. 1997). While not active
during the day, if disturbed or threatened, tarsiers will leave their sleeping
sites (Yustian 2007).
Content last modified: December 1, 2010
Written by Kurt Gron. Reviewed by Nanda Grow.
Cite this page as:
Gron KJ. 2010 December 1. Primate Factsheets: Tarsier (Tarsius) Taxonomy, Morphology, & Ecology . <http://pin.primate.wisc.edu/factsheets/entry/tarsier/taxon>. Accessed 2015 January 28.