The Philippine mouse-deer (''Tragulus nigricans''), also known as the Balabac chevrotain or ''pilandok'' (in
Filipino
Filipino may refer to:
* Something from or related to the Philippines
** Filipino language, standardized variety of 'Tagalog', the national language and one of the official languages of the Philippines.
** Filipinos, people who are citizens of th ...
), is a small,
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 ...
ruminant
Ruminants (suborder Ruminantia) are ungulate, hoofed herbivorous grazing or browsing mammals that are able to acquire nutrients from plant-based food by Enteric fermentation, fermenting it in a specialized stomach prior to digestion, principally ...
, which is
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to
Balabac
Balabac Island is the southernmost island of the Palawan province, and therefore the westernmost undisputed island in the Philippines, only about north from Sabah, Malaysia, across the Balabac Strait.
Administratively, the island forms the main ...
and nearby smaller islands (Bugsuk and Ramos) southwest of
Palawan
Palawan (), officially the Province of Palawan ( cyo, Probinsya i'ang Palawan; tl, Lalawigan ng Palawan), is an archipelagic province of the Philippines that is located in the region of Mimaropa. It is the largest province in the country in ...
in the
Philippines
The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no),
* bik, Republika kan Filipinas
* ceb, Republika sa Pilipinas
* cbk, República de Filipinas
* hil, Republ ...
. The genus ''Tragulus'' means 'little goat' and the Philippine mouse-deer has been named so due to the horizontal pupils of the eyes. This position of the pupil allows for an increase in peripheral
depth perception
Depth perception is the ability to perceive distance to objects in the world using the visual system and visual perception. It is a major factor in perceiving the world in three dimensions. Depth perception happens primarily due to stereopsis an ...
. It has traditionally been considered a
subspecies
In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. Not all species ...
of the
greater mouse-deer (''T. napu''). In 2004, though, ''T. nigricans'' was separated from ''T. napu'' as its own species due to differences in skull morphology (skull measurements).
Contrary to its
common name
In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often contrast ...
, the Philippine mouse-deer does not belong to the deer family
Cervidae
Deer or true deer are hoofed ruminant mammals forming the family Cervidae. The two main groups of deer are the Cervinae, including the muntjac, the elk (wapiti), the red deer, and the fallow deer; and the Capreolinae, including the reindeer ...
, but is a member of the
chevrotain
Chevrotains, or mouse-deer, are small even-toed ungulates that make up the family Tragulidae, the only extant members of the infraorder Tragulina. The 10 extant species are placed in three genera, but several species also are known only ...
family.
Morphology
It has a black and brown coat with white stripes on the throat and chest. Each individual hair has sections of different colors - the base is generally light (ranging from white to ashy brown), with a tawny, orange, or brown midsection, and a long black tip. The most striking markings of the Balabac chevrotain are on the throat, with three narrow white stripes beginning from a white patch under the chin and extending down towards the chest. In intense contrast to these white stripes (and sharply defining them), the rest of the throat is jet black; in some specimens the black coloration even overtakes and obscures the stripes. Towards the chest, these black and white markings disappear into a broad brown band which crosses the lower throat. The head itself is generally darker in color than the rest of the body. Broad rufous or fulvous 'eyebrow' stripes extend from the anterior corners of the eyes to the base of ears. The bridge of the nose and forehead are dark brown, becoming increasingly infused with black towards the crown of the head. The sides of the head are more fulvous. A naked glandular patch on the underside of the jaw is bordered with white, which runs into the white patch at the top of the throat. Its slender legs and arched back are covered by brown fur, with a white base. A dark line runs from each ear past the eye toward the nose. Though the Philippine mouse-deer traditionally has been considered a subspecies of the greater mouse-deer, its measurements are intermediate between those of the greater mouse-deer and the
lesser mouse-deer
The lesser mouse-deer, lesser Malay chevrotain, or kanchil (''Tragulus kanchil'') is a species of even-toed ungulate in the family Tragulidae.
Distribution
The lesser mouse-deer is found widely across Southeast Asia in Indochina, Myanmar (Kra I ...
from the nearby island of
Borneo
Borneo (; id, Kalimantan) is the third-largest island in the world and the largest in Asia. At the geographic centre of Maritime Southeast Asia, in relation to major Indonesian islands, it is located north of Java, west of Sulawesi, and eas ...
.
[ Measurements for this species have been consistent over the last eighty years of research. On average, the Balabac mouse deer measures 40–50 cm from the head to the tail base and reaches an average of 18 cm tall at shoulder height.
The male of its species does not have any ]antlers
Antlers are extensions of an animal's skull found in members of the Cervidae (deer) family. Antlers are a single structure composed of bone, cartilage, fibrous tissue, skin, nerves, and blood vessels. They are generally found only on male ...
like a true deer. They use their large, tusk-like canine teeth
In mammalian oral anatomy, the canine teeth, also called cuspids, dog teeth, or (in the context of the upper jaw) fangs, eye teeth, vampire teeth, or vampire fangs, are the relatively long, pointed teeth. They can appear more flattened howeve ...
on the upper jaw for self-defense or territorial
A territory is an area of land, sea, or space, particularly belonging or connected to a country, person, or animal.
In international politics, a territory is usually either the total area from which a state may extract power resources or a ...
fights with other males.
Behavior and ecology
It is a solitary, 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 ...
animal, but has on occasion been seen in pairs for short periods of time. The Philippine mouse-deer's main diet consists of leaves, flowers, and other vegetation in the dense forest undergrowth. During the day, it takes shelter in the dense primary and secondary forests and avoids movement. At sundown, it will wander into mangroves and more open areas to feed. They have also been spotted along the seashore.
Reproduction
The Philippine mouse-deer can be classified as a r-selected species. This type of organism lives in habitats that can be described as unstable or changing. Those falling under this category normally reach sexual maturity at a young age. ''T. nigricans'' is thought to reach sexual maturity at 5 months of age. R-selected species also have small body sizes and normally have short lifespans. The mouse-deer has been estimated to live about 14 years and usually produces one offspring per litter. Two offspring can occur, but is extremely rare. The gestation time ranges from 140 to 177 days.
In culture
The Philippine mouse-deer is usually portrayed as a trickster
In mythology and the study of folklore and religion, a trickster is a character in a story (god, goddess, spirit, human or anthropomorphisation) who exhibits a great degree of intellect or secret knowledge and uses it to play tricks or otherwi ...
in Philippine
The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no),
* bik, Republika kan Filipinas
* ceb, Republika sa Pilipinas
* cbk, República de Filipinas
* hil, Republ ...
folklore
Folklore is shared by a particular group of people; it encompasses the traditions common to that culture, subculture or group. This includes oral traditions such as tales, legends, proverbs and jokes. They include material culture, ranging ...
. In a Maranao
The Maranao people (Maranao: mәranaw Filipino: ''Maranaw''), also spelled Meranao, Maranaw, and Mëranaw, is the term used by the Philippine government to refer to the southern indigenous people who are the "people of the lake", a predomin ...
tale, the Philippine mouse-deer tricks a prince into giving up his bag of gold and facing a hive of angry bees. He is depicted as a clever guardian of the environment, using his wisdom as an advantage against those who destroy forests, seas, and wildlife. Due to this, Filipino Muslims, notably the Molbog people of southern Palawan, consider the mouse-deer as sacred.
Conservation
The Philippine mouse-deer is threatened due to a variety of reasons, such as poaching
Poaching has been defined as the illegal hunting or capturing of wild animals, usually associated with land use rights.
Poaching was once performed by impoverished peasants for subsistence purposes and to supplement meager diets. It was set a ...
and capture for the wild animal trade. Hunting has also caused a great decline in the number of individuals left. The meat is considered a delicacy on the islands, and the skin is also used to make leather. Although no true estimates of the Philippine mouse-deer population have been made to date, they are assumed to be declining in numbers. Hunters have commented that the mouse-deer is becoming harder to find. The biggest reason for decline is habitat loss
Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby ...
. The mouse-deer's habitat is being converted to agricultural lands for coconut
The coconut tree (''Cocos nucifera'') is a member of the palm tree family ( Arecaceae) and the only living species of the genus ''Cocos''. The term "coconut" (or the archaic "cocoanut") can refer to the whole coconut palm, the seed, or the ...
plantations and other crops. It is fully protected under Philippine law, but enforcement of this protection is mostly ineffective.
The Philippines do have what are called priority sites which protect the land. Currently, 18 priority sites are funded by Global Environment Facility/World Bank and the European Union. Unfortunately, ''T. nigricans'' does not occur on any of these sites to benefit from their protection.
In captivity
Outside the Philippines, the only Philippine mouse-deer in captivity are at six different collections in Europe.
' With one of the most famous being Chester Zoo
Chester Zoo is a zoo at Upton-by-Chester, Cheshire, England. Chester Zoo was opened in 1931 by George Mottershead and his family. It is one of the UK's largest zoos at . The zoo has a total land holding of approximately .
Chester Zoo is operate ...
.
References
{{Taxonbar, from=Q2098372
Tragulus
Endemic fauna of the Philippines
Fauna of Palawan
Mammals described in 1892
Taxa named by Oldfield Thomas