Philippine mouse-deer

Species of mammal

Philippine mouse-deer[1]
Conservation status

Endangered (IUCN 3.1)[2]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Tragulidae
Genus: Tragulus
Species:
T. nigricans
Binomial name
Tragulus nigricans
Thomas, 1892
Synonyms

Tragulus napu nigricans
Muntiacus nigricans

The Philippine mouse-deer (Tragulus nigricans), also known as the Balabac chevrotain or pilandok (in Filipino), is a small, nocturnal ruminant, which is endemic to Balabac and nearby smaller islands (Bugsuk and Ramos) southwest of Palawan in the Philippines. 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. It has traditionally been considered a subspecies 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).[3] Contrary to its common name, the Philippine mouse-deer does not belong to the true deer family (Cervidae), but is rather more closely connected to antelope and antelope-like bovids; it is a member of the chevrotain family, a grouping of some of the world's smallest hoofed mammals.

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.[4] 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.[5] 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 from the nearby island of Borneo.[3] 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.[6]

The male of its species does not have any antlers like a true deer. They use their large, tusk-like canine teeth on the upper jaw for self-defense or territorial fights with other males.

Behavior and ecology

It is a solitary, nocturnal 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.[7]

In culture

The Philippine mouse-deer is usually portrayed as a trickster in Philippine folklore. In a Maranao tale, the Philippine mouse-deer tricks a prince into giving up his bag of gold and facing a hive of angry bees.[8] He is depicted as a clever guardian of the environment, using his wisdom as an advantage against those who destroy forests, seas, and wildlife.[9] Due to this, Filipino Muslims, notably the Molbog people of southern Palawan, consider the mouse-deer as sacred.[10]

Conservation

The Philippine mouse-deer is threatened due to a variety of reasons, such as poaching 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.[2] The mouse-deer's habitat is being converted to agricultural lands for coconut plantations and other crops. It is fully protected under Philippine law, but enforcement of this protection is mostly ineffective.[2] 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.[11]

In captivity

Outside the Philippines, the only Philippine mouse-deers in captivity are at six different collections in Europe.[12] With one of the most famous being Chester Zoo.

References

  1. ^ Wilson, D. E.; Reeder, D. M., eds. (2005). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. ISBN 978-0-8018-8221-0. OCLC 62265494.
  2. ^ a b c Widmann, P. (2015). "Tragulus nigricans". IUCN Red List of Threatened Species. 2015: e.T22065A61977991. doi:10.2305/IUCN.UK.2015-2.RLTS.T22065A61977991.en. Retrieved 12 November 2021.
  3. ^ a b Meijaard, E.; Groves, C. P. (2004). "A taxonomic revision of the Tragulus mouse-deer (Artiodactyla)" (PDF). Zoological Journal of the Linnean Society. 140: 63–102. doi:10.1111/j.1096-3642.2004.00091.x.
  4. ^ Rabor, D. S. 1977. Philippine Birds and Mammals: A project of the U. P. Science Education Center. Quezon City: University of Philippines Press.
  5. ^ Allen, J. A., and J. R. White. 1910. Mammals from Palawan Island, Philippine Islands. Bulletin of the AMNH; 28: 13-17.
  6. ^ "Balabac chevrotain (Tragulus nigricans) - Detailed information".
  7. ^ Nowak, R. M. [editor]. 1991. Walker's Mammals of the World (Fifth Edition). Baltimore: The Johns Hopkins University Press.
  8. ^ "Tales of Laughter - Pilandok and the Sumusong-sa-Alongan". Archived from the original on 2011-07-26. Retrieved 2007-02-05.
  9. ^ "Pilandok Series by Virgilio S. Almario".
  10. ^ "Si Pilandok at Ang Manok na Nangingitlog ng Ginto".
  11. ^ Heaney, Lawrence R., and Neil Aldrin D. Mallari. A preliminary analysis of current gaps in the protection of threatened Philippine terrestrial mammals. Sylvatrop Tech. J. of Philip. Ecosystems and Nat. Res. 10(1 & 2): 28-39.
  12. ^ [1]
  • v
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Extant Artiodactyla species
Suborder Ruminantia
Antilocapridae
Antilocapra
  • Pronghorn (A. americana)
Giraffidae
Okapia
  • Okapi (O. johnstoni)
Giraffa
  • Northern giraffe (G. camelopardalis)
  • Southern giraffe (G. giraffa)
  • Reticulated giraffe (G. reticulata)
  • Masai giraffe (G. tippelskirchi)
Moschidae
Moschus
  • Anhui musk deer (M. anhuiensis)
  • Dwarf musk deer (M. berezovskii)
  • Alpine musk deer (M. chrysogaster)
  • Kashmir musk deer (M. cupreus)
  • Black musk deer (M. fuscus)
  • Himalayan musk deer (M. leucogaster)
  • Siberian musk deer (M. moschiferus)
Tragulidae
Hyemoschus
  • Water chevrotain (H. aquaticus)
Moschiola
  • Indian spotted chevrotain (M. indica)
  • Yellow-striped chevrotain (M. kathygre)
  • Sri Lankan spotted chevrotain (M. meminna)
Tragulus
  • Java mouse-deer (T. javanicus)
  • Lesser mouse-deer (T. kanchil)
  • Greater mouse-deer (T. napu)
  • Philippine mouse-deer (T. nigricans)
  • Vietnam mouse-deer (T. versicolor)
  • Williamson's mouse-deer (T. williamsoni)
Cervidae
Large family listed below
Bovidae
Large family listed below
Family Cervidae
Cervinae
Muntiacus
  • Bornean yellow muntjac (M. atherodes)
  • Hairy-fronted muntjac (M. crinifrons)
  • Fea's muntjac (M. feae)
  • Gongshan muntjac (M. gongshanensis)
  • Sumatran muntjac (M. montanus)
  • Southern red muntjac (M. muntjak)
  • Pu Hoat muntjac (M. puhoatensis)
  • Leaf muntjac (M. putaoensis)
  • Reeves's muntjac (M. reevesi)
  • Roosevelt's muntjac (M. rooseveltorum)
  • Truong Son muntjac (M. truongsonensis)
  • Northern red muntjac (M. vaginalis)
  • Giant muntjac (M. vuquangensis)
Elaphodus
  • Tufted deer (E. cephalophus)
Dama
  • European fallow deer (D. dama)
  • Persian fallow deer (D. mesopotamica)
Axis
  • Chital (A. axis)
  • Calamian deer (A. calamianensis)
  • Bawean deer (A. kuhlii)
  • Hog deer (A. porcinus)
Rucervus
  • Barasingha (R. duvaucelii)
  • Eld's deer (R. eldii)
Elaphurus
  • Père David's deer (E. davidianus)
Rusa
  • Visayan spotted deer (R. alfredi)
  • Philippine sambar (R. mariannus)
  • Rusa deer (R. timorensis)
  • Sambar (R. unicolor)
Cervus
  • Thorold's deer (C. albirostris)
  • Red deer (C. elaphus)
  • Elk (C. canadensis)
  • Central Asian red deer (C. hanglu)
  • Sika deer (C. nippon)
Capreolinae
Alces
  • Moose (A. alces)
Hydropotes
  • Water deer (H. inermis)
Capreolus
  • European roe deer (C. capreolus)
  • Siberian roe deer (C. pygargus)
Rangifer
  • Reindeer (R. tarandus)
Hippocamelus
  • Taruca (H. antisensis)
  • South Andean deer (H. bisulcus)
Mazama
  • Red brocket (M. americana)
  • Small red brocket (M. bororo)
  • Merida brocket (M. bricenii)
  • Dwarf brocket (M. chunyi)
  • Gray brocket (M. gouazoubira)
  • Pygmy brocket (M. nana)
  • Amazonian brown brocket (M. nemorivaga)
  • Little red brocket (M. rufina)
  • Central American red brocket (M. temama)
Ozotoceros
  • Pampas deer (O. bezoarticus)
Blastocerus
  • Marsh deer (B. dichotomus)
Pudu
  • Northern pudu (P. mephistophiles)?
  • Southern pudu (P. pudu)
Pudella?
  • Peruvian Yungas pudu (P. carlae)
  • Northern pudu (P. mephistophiles)
Odocoileus
  • Mule deer (O. hemionus)
  • Yucatan brown brocket (O. pandora)
  • White-tailed deer (O. virginianus)
Family Bovidae
Hippotraginae
Hippotragus
  • Roan antelope (H. equinus)
  • Sable antelope (H. niger)
Oryx
  • East African oryx (O. beisa)
  • Scimitar oryx (O. dammah)
  • Gemsbok (O. gazella)
  • Arabian oryx (O. leucoryx)
Addax
  • Addax (A. nasomaculatus)
Reduncinae
Kobus
  • Waterbuck (K. ellipsiprymnus)
  • Kob (K. kob)
  • Lechwe (K. leche)
  • Nile lechwe (K. megaceros)
  • Puku (K. vardonii)
Redunca
  • Southern reedbuck (R. arundinum)
  • Mountain reedbuck (R. fulvorufula)
  • Bohor reedbuck (R. redunca)
Aepycerotinae
Aepyceros
  • Impala (A. melampus)
Peleinae
Pelea
  • Grey rhebok (P. capreolus)
Alcelaphinae
Beatragus
  • Hirola (B. hunteri)
Damaliscus
  • Common tsessebe (D. lunatus)
  • Bontebok (D. pygargus)
Alcelaphus
  • Hartebeest (A. buselaphus)
Connochaetes
  • Black wildebeest (C. gnou)
  • Blue wildebeest (C. taurinus)
Pantholopinae
Pantholops
  • Tibetan antelope (P. hodgsonii)
Caprinae
Large subfamily listed below
Bovinae
Large subfamily listed below
Antilopinae
Large subfamily listed below
Family Bovidae (subfamily Caprinae)
Ammotragus
  • Barbary sheep (A. lervia)
Arabitragus
  • Arabian tahr (A. jayakari)
Budorcas
  • Takin (B. taxicolor)
Capra
  • Wild goat (C. aegagrus)
  • West Caucasian tur (C. caucasia)
  • East Caucasian tur (C. cylindricornis)
  • Markhor (C. falconeri)
  • Domestic goat (C. hircus)
  • Alpine ibex (C. ibex)
  • Nubian ibex (C. nubiana)
  • Iberian ibex (C. pyrenaica)
  • Siberian ibex (C. sibirica)
  • Walia ibex (C. walie)
Capricornis
  • Japanese serow (C. crispus)
  • Red serow (C. rubidus)
  • Mainland serow (C. sumatraensis)
  • Taiwan serow (C. swinhoei)
Hemitragus
  • Himalayan tahr (H. jemlahicus)
Naemorhedus
  • Red goral (N. baileyi)
  • Long-tailed goral (N. caudatus)
  • Himalayan goral (N. goral)
  • Chinese goral (N. griseus)
Oreamnos
  • Mountain goat (O. americanus)
Ovibos
  • Muskox (O. moschatus)
Nilgiritragus
  • Nilgiri tahr (N. hylocrius)
Ovis
  • Argali (O. ammon)
  • Domestic sheep (O. aries)
  • Bighorn sheep (O. canadensis)
  • Dall sheep (O. dalli)
  • Mouflon (O. gmelini)
  • Snow sheep (O. nivicola)
  • Urial (O. vignei)
Pseudois
  • Bharal (P. nayaur)
Rupicapra
  • Pyrenean chamois (R. pyrenaica)
  • Chamois (R. rupicapra)
Family Bovidae (subfamily Bovinae)
Boselaphini
Tetracerus
  • Four-horned antelope (T. quadricornis)
Boselaphus
  • Nilgai (B. tragocamelus)
Bovini
Bubalus
  • Wild water buffalo (B. arnee)
  • Domestic water buffalo (B. bubalis)
  • Lowland anoa (B. depressicornis)
  • Tamaraw (B. mindorensis)
  • Mountain anoa (B. quarlesi)
Bos
  • American bison (B. bison)
  • European bison (B. bonasus)
  • Bali cattle (B. domesticus)
  • Gayal (B. frontalis)
  • Gaur (B. gaurus)
  • Domestic yak (B. grunniens)
  • Zebu (B. indicus)
  • Banteng (B. javanicus)
  • Wild yak (B. mutus)
  • Cattle (B. taurus)
Pseudoryx
  • Saola (P. nghetinhensis)
Syncerus
  • African buffalo (S. caffer)
Tragelaphini
Tragelaphus
(including kudus)
  • Nyala (T. angasii)
  • Mountain nyala (T. buxtoni)
  • Bongo (T. eurycerus)
  • Lesser kudu (T. imberbis)
  • Harnessed bushbuck (T. scriptus)
  • Sitatunga (T. spekeii)
  • Greater kudu (T. strepsiceros)
  • Cape bushbuck (T. sylvaticus)
Taurotragus
  • Giant eland (T. derbianus)
  • Common eland (T. oryx)
Family Bovidae (subfamily Antilopinae)
Antilopini
Ammodorcas
  • Dibatag (A. clarkei)
Antidorcas
  • Springbok (A. marsupialis)
Antilope
  • Blackbuck (A. cervicapra)
Eudorcas
  • Mongalla gazelle (E. albonotata)
  • Red-fronted gazelle (E. rufifrons)
  • Thomson's gazelle (E. thomsonii)
  • Heuglin's gazelle (E. tilonura)
Gazella
  • Chinkara (G. bennettii)
  • Cuvier's gazelle (G. cuvieri)
  • Dorcas gazelle (G. dorcas)
  • Erlanger's gazelle (G. erlangeri)
  • Mountain gazelle (G. gazella)
  • Rhim gazelle (G. leptoceros)
  • Speke's gazelle (G. spekei)
  • Goitered gazelle (G. subgutturosa)
Litocranius
  • Gerenuk (L. walleri)
Nanger
  • Dama gazelle (N. dama)
  • Grant's gazelle (N. granti)
  • Bright's gazelle (N. notatus)
  • Peter's gazelle (N. petersii)
  • Soemmerring's gazelle (N. soemmerringii)
Procapra
  • Mongolian gazelle (P. gutturosa)
  • Goa (P. picticaudata)
  • Przewalski's gazelle (P. przewalskii)
Saigini
Pantholops
  • Tibetan antelope (P. hodgsonii)
Saiga
  • Saiga antelope (S. tatarica)
Neotragini
Dorcatragus
  • Beira (D. megalotis)
Madoqua
  • Günther's dik-dik (M. guentheri)
  • Kirk's dik-dik (M. kirkii)
  • Silver dik-dik (M. piacentinii)
  • Salt's dik-dik (M. saltiana)
Neotragus
  • Bates' pygmy antelope (N. batesi)
  • Suni (N. moschatus)
  • Royal antelope (N. pygmaeus)
Oreotragus
  • Klipspringer (O. oreotragus)
Ourebia
  • Oribi (O. ourebi)
Raphicerus
  • Steenbok (R. campestris)
  • Cape grysbok (R. melanotis)
  • Sharpe's grysbok (R. sharpei)
Cephalophini
Cephalophus
  • Aders's duiker (C. adersi)
  • Brooke's duiker (C. brookei)
  • Peters' duiker (C. callipygus)
  • White-legged duiker (C. crusalbum)
  • Bay duiker (C. dorsalis)
  • Harvey's duiker (C. harveyi)
  • Jentink's duiker (C. jentinki)
  • White-bellied duiker (C. leucogaster)
  • Red forest duiker (C. natalensis)
  • Black duiker (C. niger)
  • Black-fronted duiker (C. nigrifrons)
  • Ogilby's duiker (C. ogilbyi)
  • Ruwenzori duiker (C. rubidis)
  • Red-flanked duiker (C. rufilatus)
  • Yellow-backed duiker (C. silvicultor)
  • Abbott's duiker (C. spadix)
  • Weyns's duiker (C. weynsi)
  • Zebra duiker (C. zebra)
Philantomba
  • Blue duiker (P. monticola)
  • Maxwell's duiker (P. maxwellii)
  • Walter's duiker (P. walteri)
Sylvicapra
  • Common duiker (S. grimmia)
Suborder Suina
Suidae
Babyrousa
  • Buru babirusa (B. babyrussa)
  • North Sulawesi babirusa (B. celebensis)
  • Togian babirusa (B. togeanensis)
Hylochoerus
  • Giant forest hog (H. meinertzhageni)
Phacochoerus
  • Desert warthog (P. aethiopicus)
  • Common warthog (P. africanus)
Porcula
  • Pygmy hog (P. salvania)
Potamochoerus
  • Bushpig (P. larvatus)
  • Red river hog (P. porcus)
Sus
  • Palawan bearded pig (S. ahoenobarbus)
  • Bornean bearded pig (S. barbatus)
  • Visayan warty pig (S. cebifrons)
  • Celebes warty pig (S. celebensis)
  • Domestic pig (S. domesticus)
  • Flores warty pig (S. heureni)
  • Oliver's warty pig (S. oliveri)
  • Philippine warty pig (S. philippensis)
  • Wild boar (S. scrofa)
  • Timor warty pig (S. timoriensis)
  • Javan warty pig (S. verrucosus)
Tayassuidae
Tayassu
  • White-lipped peccary (T. pecari)
Catagonus
  • Chacoan peccary (C. wagneri)
Dicotyles
  • Collared peccary (D. tajacu)
Suborder Tylopoda
Camelidae
Lama
  • Llama (L. glama)
  • Guanaco (L. guanicoe)
  • Alpaca (L. pacos)
  • Vicuña (L. vicugna)
Camelus
  • Domestic Bactrian camel (C. bactrianus)
  • Dromedary/Arabian camel (C. dromedarius)
  • Wild Bactrian camel (C. ferus)
Suborder Whippomorpha
Hippopotamidae
Hippopotamus
  • Hippopotamus (H. amphibius)
Choeropsis
  • Pygmy hippopotamus (C. liberiensis)
Cetacea
  • see Cetacea
Taxon identifiers
Tragulus nigricans