Geographic Range
Sunda flying lemurs are found in Southeast Asia and are endemic to Indochina and Sundaland,
an area which includes the Malay Peninsula and the surrounding islands.
Habitat
Sunda flying lemurs are strictly arboreal, spending their entire lives in the treetops
of tropical rainforests. They can also be found in highlands and can readily adapt
to disturbed forests edges and plantations.
- Habitat Regions
- tropical
- Terrestrial Biomes
- rainforest
- Other Habitat Features
- agricultural
Physical Description
Sunda flying lemurs have small heads, large and forward-facing eyes, wide brows, and
small ears. They have blunt snouts, and there are no obvious whiskers on their faces.
The fur of Sunda flying lemurs is dense and mottled. While the underside is pale,
the dorsal fur can be white, gray, black, or red. Unlike
Philippine flying lemurs
, Sunda flying lemurs have bold patches of color that look similar to lichen on a
tree, which aid in camouflage. While Sunda flying lemurs cannot fly, a membrane of
skin called a patagium allows them to glide. This membrane is fully furred, extending
along the limbs from the neck to the fingers, toes and tail. When gliding, the patagium
can extend to about 70 cm with the help of an extensor muscle in the flank membrane.
Sunda flying lemurs have four legs of similar size with webbed feet and curled claws.
Their digits are flattened, and the soles of the feet can form sucking discs to allow
a better grip while climbing. Sunda flying lemurs weigh 0.9 to 2 kg (2 to 4.5 lbs)
and are 33 to 42 cm in length with 17.5 to 27 cm tails.
Sunda flying lemurs have 34 carnivore-like teeth. Flying lemurs of the family
Cynocephalidae
have unique comb-shaped bottom incisors, which can be used for straining or grooming.
These incisors include up to up to 20 prongs per tooth. While most incisors of mammals
are single rooted, the second incisors of Sunda flying lemurs are double rooted. The
front of the top jaw is toothless as the upper incisors are positioned at the sides
of the jaw. The canines of Sunda flying lemurs resemble pre-molars.
- Other Physical Features
- endothermic
- bilateral symmetry
- Sexual Dimorphism
- sexes alike
Reproduction
Little is known about the reproductive systems and courtships of Sunda flying lemurs.
Sunda flying lemurs can mate throughout the year. After a gestation period of about
60 days, female Sunda flying lemurs give birth to a single offspring. Rarely, twins
can be born. The offspring is born underdeveloped and weighs around 35 g. Weaning
occurs at six months of age, and adulthood is reached at about three years. The mother
can mate again shortly after giving birth, and it is possible for a female to be pregnant
while still nursing.
- Key Reproductive Features
- year-round breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- sexual
- fertilization
- viviparous
Offspring of Sunda flying lemurs nurse from a single pair of mammae located near the
mother's armpits. The mother can fold her patagium into a pouch to protect and warm
her offspring. Young Sunda flying lemurs are dependent on the mother until they are
weaned. Offspring cling to the underside of the mother, if not in the pouch, even
when she is gliding from tree to tree.
- Parental Investment
- altricial
- female parental care
-
pre-hatching/birth
-
provisioning
- female
-
protecting
- female
-
provisioning
-
pre-weaning/fledging
-
provisioning
- female
-
protecting
- female
-
provisioning
Lifespan/Longevity
Little information is available on the lifespan of Sunda flying lemurs, but the oldest
known captive flying lemur of the family
Cynocephalidae
was 17.5 years old.
Behavior
Sunda flying lemurs are mainly nocturnal. During the day, they sleep in holes in trees
or high in the dense foliage of the treetops. They grasp the underside of branches
or the trunk of a tree with all four feet. Climbing trees involves stretching out
the two front legs then bringing up the two back legs, giving an awkward, hopping
appearance. When threatened, this species either climbs higher into the trees or completely
stops moving. Sunda flying lemurs are strictly arboreal and are quite helpless on
the forest floor. They are able to glide over 100 m with little loss in elevation.
Sunda flying lemurs live alone or in small, loosely connected groups. However, they
can be territorial of sleeping and foraging areas.
- Key Behaviors
- arboreal
- scansorial
- glides
- nocturnal
- motile
- solitary
- territorial
Home Range
Not much is known regarding the home ranges of Sunda flying lemurs, although home
ranges broadly overlap. In the protected forests of Singapore, one Sunda flying lemur
is estimated per two hectares.
Communication and Perception
As most Sunda flying lemurs are solitary, little is known about communication between
individuals. They can be territorial of sleeping and foraging areas, though information
regarding territorial behavior is limited.
- Communication Channels
- acoustic
Food Habits
Sunda flying lemurs are strictly herbivorous. They feed on soft plant parts such as
fruits, flowers, buds, young leaves, nectar, and sap. The unusually comb-shaped lower
incisors are thought to be used to scrape up sap from trees or to strain fruits and
flowers.
- Plant Foods
- leaves
- fruit
- nectar
- flowers
- sap or other plant fluids
Predation
Humans
are among the few known predators of Sunda flying lemurs. If threatened, these animals
either freeze or climb higher into the trees. Bold patches of fur that look similar
lichen provide camouflage against predators. Sunda flying lemurs also glide away to
escape predators, gliding up to up to 100 m with minimal loss in altitude.
- Anti-predator Adaptations
- cryptic
Ecosystem Roles
As Sunda flying lemurs consume fruit and flowers, they may aid in seed dispersal as
well as flower pollination.
- Ecosystem Impact
- disperses seeds
- pollinates
Economic Importance for Humans: Positive
Sunda flying lemurs are occasionally hunted for their meat and skin. As the closest
living relatives to
primates
, the genome of Sunda flying lemurs could prove evolutionarily enlightening.
- Positive Impacts
- food
- body parts are source of valuable material
- research and education
Economic Importance for Humans: Negative
Because Sunda flying lemurs adapt well to disturbed and fragmented forests and plantations,
they are considered as pests for fruit crops.
- Negative Impacts
- crop pest
Conservation Status
Although Sunda flying lemurs are fairly adaptive to disturbed forests, their numbers
have been decreasing due to habitat loss from logging and the conversion of native
forests into farm land. Nonetheless, Sunda flying lemurs are considered at low risk
of extinction by the IUCN Red List.
Other Comments
Sunda flying lemurs are also known as Malayan flying lemurs, as they inhabit both
Malaysia and the Malay Peninsula. Sunda flying lemurs have previously been classified
as and/or linked to
insectivores
,
bats
, and
primates
. This species is difficult to breed and sustain in captivity. Few formal studies
have been conducted on Sunda flying lemurs, and there is much yet to learn.
Additional Links
Contributors
Katrina Beatson (author), Northern Michigan University, John Bruggink (editor), Northern Michigan University, Gail McCormick (editor), Animal Diversity Web Staff.
- oriental
-
found in the oriental region of the world. In other words, India and southeast Asia.
- native range
-
the area in which the animal is naturally found, the region in which it is endemic.
- tropical
-
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
- rainforest
-
rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Epiphytes and climbing plants are also abundant. Precipitation is typically not limiting, but may be somewhat seasonal.
- agricultural
-
living in landscapes dominated by human agriculture.
- year-round breeding
-
breeding takes place throughout the year
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- fertilization
-
union of egg and spermatozoan
- viviparous
-
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
- altricial
-
young are born in a relatively underdeveloped state; they are unable to feed or care for themselves or locomote independently for a period of time after birth/hatching. In birds, naked and helpless after hatching.
- female parental care
-
parental care is carried out by females
- arboreal
-
Referring to an animal that lives in trees; tree-climbing.
- nocturnal
-
active during the night
- motile
-
having the capacity to move from one place to another.
- solitary
-
lives alone
- territorial
-
defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement
- acoustic
-
uses sound to communicate
- visual
-
uses sight to communicate
- tactile
-
uses touch to communicate
- acoustic
-
uses sound to communicate
- chemical
-
uses smells or other chemicals to communicate
- cryptic
-
having markings, coloration, shapes, or other features that cause an animal to be camouflaged in its natural environment; being difficult to see or otherwise detect.
- food
-
A substance that provides both nutrients and energy to a living thing.
- herbivore
-
An animal that eats mainly plants or parts of plants.
- folivore
-
an animal that mainly eats leaves.
- frugivore
-
an animal that mainly eats fruit
- endothermic
-
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
- bilateral symmetry
-
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
References
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Shapiro, L. 2010. "Galeopterus variegatus (Audebert, 1799)" (On-line). Encyclopedia of Life. Accessed January 18, 2011 at http://www.eol.org/pages/1040858 .
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