The slender lorises (''Loris'') are a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of
loris
Loris is the common name for the strepsirrhine mammals of the subfamily Lorinae (sometimes spelled Lorisinae) in the family Lorisidae. ''Loris'' is one genus in this subfamily and includes the slender lorises, ''Nycticebus'' is the genus conta ...
native to
India
India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
and
Sri Lanka
Sri Lanka (, ; si, ශ්රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...
. The genus comprises two species, the
red slender loris
The red slender loris (''Loris tardigradus'') is a small, nocturnal strepsirrhine primate native to the rainforests of Sri Lanka. This is No. 6 of the 10 focal species and No. 22 of the 100 EDGE mammal species worldwide considered the most evo ...
found in Sri Lanka and the
gray slender loris
The gray slender loris (''Loris lydekkerianus'') is a species of primate in the family Loridae. It is native to India and Sri Lanka and inhabits subtropical and tropical dry forests and subtropical or tropical moist lowland forests. It is threa ...
from Sri Lanka and India. Slender lorises spend most of their life in trees, traveling along the tops of branches with slow and precise movements. They are found in
tropical rainforest
Tropical rainforests are rainforests that occur in areas of tropical rainforest climate in which there is no dry season – all months have an average precipitation of at least 60 mm – and may also be referred to as ''lowland equatori ...
s,
scrub forest
Shrubland, scrubland, scrub, brush, or bush is a plant community characterized by vegetation dominated by shrubs, often also including grasses, herbs, and geophytes. Shrubland may either occur naturally or be the result of human activity. It ma ...
s, semi-
deciduous forest
In the fields of horticulture and Botany, the term ''deciduous'' () means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, aft ...
s, and
swamp
A swamp is a forested wetland.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p. Swamps are considered to be transition zones because both land and water play a role in ...
s. The primates have lifespans of approximately 15 years and are
nocturnal
Nocturnality is an animal behavior characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal", versus diurnal meaning the opposite.
Nocturnal creatures generally have highly developed sens ...
. Slender lorises generally feed on insects, reptiles, plant shoots, and fruit.
Taxonomy
![Slender Loris](https://upload.wikimedia.org/wikipedia/commons/8/8f/Slender_Loris.jpg)
The
type species
In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...
was named ''
Lemur tardigradus'' by
Linnaeus
Carl Linnaeus (; 23 May 1707 – 10 January 1778), also known after his ennoblement in 1761 as Carl von Linné Blunt (2004), p. 171. (), was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, the ...
in 1758. The name ''Loris'' is first reported
Georges-Louis Leclerc, Comte de Buffon
Georges-Louis Leclerc, Comte de Buffon (; 7 September 1707 – 16 April 1788) was a French naturalist, mathematician, cosmologist, and encyclopédiste.
His works influenced the next two generations of naturalists, including two prominent ...
in 1765, representing the Dutch ''
loeris'' meaning "clown". According to Buffon, the name ''loeris'' had been in use for some time by Dutch naturalists for the "sloths of Ceylon".
The genus ''Loris'' was separated from
lemur
Lemurs ( ) (from Latin ''lemures'' – ghosts or spirits) are Strepsirrhini, wet-nosed primates of the Superfamily (biology), superfamily Lemuroidea (), divided into 8 Family (biology), families and consisting of 15 genera and around 100 exist ...
s by
Étienne Geoffroy Saint-Hilaire
Étienne Geoffroy Saint-Hilaire (15 April 177219 June 1844) was a French naturalist who established the principle of "unity of composition". He was a colleague of Jean-Baptiste Lamarck and expanded and defended Lamarck's evolutionary theories ...
(1796), based on a suggestion of a ''Lorican'' genus by
Louis-Jean-Marie Daubenton
Louis Jean-Marie Daubenton (29 May 1716 – 1 January 1800) was a French naturalist and contributor to the ''Encyclopédie ou Dictionnaire raisonné des sciences, des arts et des métiers''.
Biography
Daubenton was born at Montbard, Côte-d' ...
(1792). Saint-Hilaire's ''Loris'' at first included Daubenton's type species, ''Loris de Buffon'', which he however delegated to the new ''
Nycticebus
Slow lorises are a group of several species of nocturnal strepsirrhine primates that make up the genus ''Nycticebus''. Found in Southeast Asia and bordering areas, they range from Bangladesh and Northeast India in the west to the Sulu Archip ...
'' genus in 1812.
* Family
Lorisidae
Lorisidae (or sometimes Loridae) is a family of strepsirrhine primates. The lorisids are all slim arboreal animals and comprise the lorises, pottos and angwantibos. Lorisids live in tropical, central Africa as well as in south and southeast Asia. ...
** Subfamily
Perodicticinae
Perodicticinae is a subfamily of the family Lorisidae. It includes five species of African primates as shown under taxonomy below.
They have a vestigial tail and index finger. The snout is pointed and the ears and eyes are large. The coat is de ...
: African lorisids
** Subfamily
Lorisinae
Loris is the common name for the strepsirrhine mammals of the subfamily Lorinae (sometimes spelled Lorisinae) in the family Lorisidae. ''Loris'' is one genus in this subfamily and includes the slender lorises, ''Nycticebus'' is the genus contain ...
: Asian lorisids
*** Genus ''Loris''
****
Red slender loris
The red slender loris (''Loris tardigradus'') is a small, nocturnal strepsirrhine primate native to the rainforests of Sri Lanka. This is No. 6 of the 10 focal species and No. 22 of the 100 EDGE mammal species worldwide considered the most evo ...
, ''Loris tardigradus''
****
Gray slender loris
The gray slender loris (''Loris lydekkerianus'') is a species of primate in the family Loridae. It is native to India and Sri Lanka and inhabits subtropical and tropical dry forests and subtropical or tropical moist lowland forests. It is threa ...
, ''Loris lydekkerianus''
*** Genus ''
Nycticebus
Slow lorises are a group of several species of nocturnal strepsirrhine primates that make up the genus ''Nycticebus''. Found in Southeast Asia and bordering areas, they range from Bangladesh and Northeast India in the west to the Sulu Archip ...
'': slow lorises
*** Genus ''
Xanthonycticebus
The pygmy slow loris (''Xanthonycticebus pygmaeus'') is a species of slow loris found east of the Mekong River in Vietnam, Laos, eastern Cambodia, and China. It occurs in a variety of forest habitats, including tropical dry forests, semi-evergre ...
'': pygmy slow loris
![Sri Lankan Slender Loris 2](https://upload.wikimedia.org/wikipedia/commons/8/81/Sri_Lankan_Slender_Loris_2.jpg)
In India, slender lorises are known as () or in
Telugu
Telugu may refer to:
* Telugu language, a major Dravidian language of India
*Telugu people, an ethno-linguistic group of India
* Telugu script, used to write the Telugu language
** Telugu (Unicode block), a block of Telugu characters in Unicode
S ...
, () in
Kannada
Kannada (; ಕನ್ನಡ, ), originally romanised Canarese, is a Dravidian language spoken predominantly by the people of Karnataka in southwestern India, with minorities in all neighbouring states. It has around 47 million native s ...
, ''Kaada Naramani'' (ಕಾಡ ನರಮನಿ) in
Tulu and in
Marathi
Marathi may refer to:
*Marathi people, an Indo-Aryan ethnolinguistic group of Maharashtra, India
*Marathi language, the Indo-Aryan language spoken by the Marathi people
*Palaiosouda, also known as Marathi, a small island in Greece
See also
*
* ...
. In Sri Lanka they are known as () in
Sinhala, in
Tamil
Tamil may refer to:
* Tamils, an ethnic group native to India and some other parts of Asia
**Sri Lankan Tamils, Tamil people native to Sri Lanka also called ilankai tamils
**Tamil Malaysians, Tamil people native to Malaysia
* Tamil language, nativ ...
, spoken across southern India and Sri Lanka and in
Malayalam
Malayalam (; , ) is a Dravidian language spoken in the Indian state of Kerala and the union territories of Lakshadweep and Puducherry (Mahé district) by the Malayali people. It is one of 22 scheduled languages of India. Malayalam was des ...
, spoken mainly in the Indian state of Kerala, they are known as (in Tamil , ) (, , or (meaning 'the slender-bodied one') and in Malayalam ).
Distribution and habitat
The red slender loris is found in Sri Lanka while the gray slender loris is found in Sri Lanka and India. The two subspecies of red slender loris differ in their habitat preference, the lowland loris, ''L. t. tardigradus'', favors wet lowland forests (up to 470 m above sea level) in the south western wet-zone of Sri Lanka while the mountain loris, ''L. t. nycticeboides'', prefers cloud, montane, and highland evergreen forests at elevations of 1800–2300 m. The gray slender loris can be found in tropical rainforests, primary and some secondary, coastal acacia scrub forests, semi-evergreen forests, swamps, and bamboo groves up to 2000 m above sea level.
Behaviour
Female slender lorises generally have an exclusive home range while males may overlap with others. They often form small social groups to sleep, containing adults of both sexes as well as the young. The groups also undertake mutual grooming and play wrestling. The adults typically hunt separately during the night. Males will follow females while they are in
oestrus
The estrous cycle (, originally ) is the set of recurring physiological changes that are induced by reproductive hormones in most mammalian therian females. Estrous cycles start after sexual maturity in females and are interrupted by anestrous ...
and mating may occur after a bout of play fighting. Gray slender lorises will often bear twins but the survival rate is low. Newborn infants cling to the mother's front for a few weeks and after that will be kept on a tree while the mother goes off to feed.
They make nests out of leaves or find hollows of trees or a similar secure place to live in.
Diet
The slender lorises are one of the most faunivorous primates; the red slender loris has only been observed eating animal prey while the gray slender loris is primarily carnivorous (mostly insects) but will also eat bird eggs, berries, leaves, buds and occasionally invertebrates as well as geckos and lizards. To maximize protein and nutrient uptake they consume every part of their prey, including the scales and bones. They are able to digest toxic prey such as ants and noxious beetles, urinating on their hands before entering ant colonies to mimic the chemical profile of their prey to avoid attack.
Threats
According to biologists, poaching activity has led to the steady decline of the species in Tamil Nadu. Native people have always believed that all parts of the slender loris have some medicinal or magical powers. This has contributed greatly to the decline of the slender loris. In addition, slender lorises are illegally smuggled to supply a growing exotic pet trade. Other threats include habitat loss, electrocution on live wires, and road accidents. Along the western region of
Tamil Nadu
Tamil Nadu (; , TN) is a States and union territories of India, state in southern India. It is the List of states and union territories of India by area, tenth largest Indian state by area and the List of states and union territories of India ...
, there is a vigorous clampdown on illegal poaching of slender lorises.
Destruction of tropical rain forest habitat is also contributing to declines in population.
IUCN has listed them as Endangered, whereas they are listed under the Schedule I of the Wildlife (Protection) Act of India, 1972, according them the highest level of legal protection. WWF-India is working to protect the habitats of the Slender Loris through its wider conservation work in the Western Ghats - Nilgiris Landscape.
Kadavur Slender Loris Sanctuary
Kadavur Slender Loris Sanctuary was declared as India's first Slender Loris Sanctuary.
It is located in Karur and Dindigul districts of Tamilnadu. This wildlife sanctuary has an area of .
References
{{Authority control
Lorises
Mammals of India
Mammals of Sri Lanka
Taxa named by Étienne Geoffroy Saint-Hilaire