Philippine Tarsier

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Philippine Tarsier[1]

Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Family: Tarsiidae
Genus: Tarsius
Species: T. syrichta
Binomial name
Tarsius syrichta
(Linnaeus, 1758)
Geographic distribution of Philippine Tarsier
Geographic distribution of Philippine Tarsier

The Philippine Tarsier (Tarsius syrichta), known locally as the Mawmag in Cebuano/Visayan, is an endangered tarsier species endemic to the Philippines. It is found in the southeastern part of the archipelago, particularly in the provinces of Bohol, Samar, Leyte, and Mindanao, Philippines.[3] Its name is derived from its elongated "tarsus" or ankle bone.[4]

Its geographic range also includes Maripipi Island, Siargao Island, Basilan Island and Dinagat Island.[2] Tarsiers have also been reported in Sarangani, although they may be different subspecies. Believed to be about 45 million years old,[5] and perhaps one of the oldest land species to continuously live in the Philippines, it was only introduced to western biologists in the 18th century.[6]

Contents

[edit] Anatomy and morphology

The Philippine Tarsier is a tiny animal, measuring about 4 to 6 inches (15 cm) in height. The small size makes it difficult to spot. The average mass for males is around 134 grams, and for females, around 117 grams. The average adult is about the size of a human fist and will fit very comfortably in the human hand.

Like all tarsiers, the Philippine Tarsier's eyes are fixed in its skull; they cannot turn in their sockets. Instead, a special adaptation in the neck allows its round head to be rotated 180 degrees. The large membranous ears are mobile,[7] appearing to be almost constantly moving, allowing the tarsier to hear any movement. It has uniquely large eyes (disproportionate to its head and body), which are listed in the Guinness Book of Records as the largest eyes on any mammal. These huge eyes provide this nocturnal animal with excellent night vision.[8]

The Philippine Tarsier has thick and silky fur which is colored gray to dark brown. The thin tail, usually used for balance, is naked or bald except for a tuft of hair at the end, and is about twice the body length. Its elongated "tarsus," or ankle bone, which gives the tarsier its name, allows it to jump at least three meters from tree to tree without having to touch the ground.[8] Its long digits are tipped with rounded pads that allow T. syrichta to cling easily to trees and to grip almost any surface. The thumb is not truly opposable, but the first toe is. All of the digits have flattened nails, except for the second and third toes, which have sharp claws specialized for grooming.[9]

The dental formula is 2:1:3:3 in the upper jaw and 1:1:3:3 in the lower jaw, with relatively small upper canines.[7]

[edit] Range and distribution

The Philippine Tarsier, as its name suggests, is endemic to the Philippine archipelago.[10] Tarsius syrichta populations are generally found in the southeastern part of the archipelago. Established populations are present particularly on the islands of Bohol, Samar, Leyte and Mindanao.[3] They have also been found on various isolated islands within its known range, such as Maripipi Island, Siargao Island, Basilan Island and Dinagat Island.[2]

[edit] Ecology and life history

Tarsier tree climbing
Tarsier tree climbing

[edit] Habitat

The Philippine Tarsier's habitat is the second growth, secondary forest, and primary forest from sea level to 700 m.[10] Its habitat also include tropical rainforest with dense vegetation and trees that offer it protection like tall grasses, bushes and bamboo shoots.

Research findings also show that the Philippine Tarsier prefer dense, low-level vegetation in secondary forests, with perching sites averaging 2 meters above the ground.[11]

[edit] Home range

Initial studies show that the Philippine Tarsier appears to have a home range of 1 to 2 hectares.[3] Recent research shows that home ranges averaged 6.45 hectares for males and 2.45 hectares for females (MCP and Kernel 95%), allowing for a density of 16 male and 41 female tarsiers per 100 ha.[12]

Research findings also show that while both male and female tarsiers are solitary animals, they cross each other's paths under the cover of nightfall as they hunt for prey. They travel up to one and a half kilometres across the forest and the optimal area is more than six hectares.[13]

[edit] Ecosystem roles

Besides human hunters, feral cats banished from nearby communities are the species' main predators, though some large birds are known to prey on it as well.[14] Because of its nocturnal and arboreal habits, the Philippine Tarsier is most likely to fall prey to owls, or to small carnivores which it can encounter in its canopy homes.

[edit] Feeding ecology

The Philippine Tarsier is carnivorous. Primarily insectivorous, its diet consists of live insects and it has also been observed to feed on spiders, small crustaceans, and small vertebrates such as small lizards and birds. Tarsius syrichta preys on live insects, particularly crickets and grasshoppers. Upon seizing its prey, the tarsier carries it to its mouth using both hands.[3]

As predators, the Philippine Tarsier may help to structure insect communities. To the extent that it is preyed upon by other animals, it may impact predator populations.

[edit] Behavior

The Philippine Tarsier is a shy nocturnal[3] animal that leads a mostly hidden life, asleep during the day and only active to look for food during the night. During the day, it sleeps in dark hollows close to the ground, near the trunks of trees and shrubs deep in the impenetrable bushes and forests. They only become active at night, and even then, with their much better sight and amazing ability to maneuver around trees, are very well able to avoid humans.[6]

It is arboreal[3] and is a vertical clinger and leaper,[7] habitually clinging vertically to trees and are capable of leaping from branch to branch.

The Philippine Tarsier is solitary. However, it is found to have either monogamous or polygamous mating system.[7]

[edit] Communication

The Philippine Tarsier uses varied means of communication. Although less vocal than many primate species, it uses calls which are often associated with territorial maintenance and male-female spacing.[3] Its "loud call" is a loud piercing single note. When content, it emits a sound similar to a soft sweet bird-like twill. And when several tarsiers come together, they have a chirping, locust-like sound.[15]

Its vocal communication is the distress call made by infants when they are separated from their mothers. It is also the call made by males to their mates during mating season. Its olfactory communication is the marking of a scent from the circumoral gland which the female uses to mark her mate with the gland located around the mouth. It is also the marking of a male's territory with the use of urine. Its tactile communication is the social grooming done when one tarsier grooms the other, removing dead skin and parasites, observed in females on adult males, as well as in females on their offspring.[7]

[edit] Life history

Tarsier with a baby
Tarsier with a baby

[edit] Reproduction

The Philippine Tarsier's pregnancy or gestation period lasts about 6 months. The female's estrous cycle lasts 25-28 days.[7] Mating season begins in April to May. The males "plug" the female’s vagina after intercourse. The female gives birth to one offspring per gestation. The infant is born with a lot of hair and born with its eyes open. The females carry their infants in their mouth. A new born can already cling to branches and in less than a month after birth, it can start leaping.

The Philippine Tarsier reproduces poorly in captivity.[16]

[edit] Etymology and taxonomic history

The Philippine Tarsier has been called "the world's smallest monkey" or "smallest primate" by locals before. However, the Philippine Tarsier is neither a monkey nor the smallest primate. It is related to other primates, including monkeys, lemurs, gorillas and humans but it occupies a small evolutionary branch between the strepsirrhine prosimians, and the haplorrhine simians. While it is a prosimian, and used to be grouped with the rest of the prosimians, it has some phylogenetic features that caused scientists to classify it as a haplorrhine and, therefore, more closely related to apes and monkeys than to the other prosimians.

The smallest primate is the Pygmy Mouse Lemur while the smallest monkey is the Pygmy Marmoset. Nevertheless, the Philippine Tarsier is still one of the smallest primates, and is considered to be the mammal with the biggest eyes.[citation needed]

Although the species is believed to be about 45 million years old, and is perhaps one of the oldest land species to continuously live in the Philippines, it was only introduced to Western biologists in the 18th century through the description given to J. Petiver by the missionary J.G. Camel of an animal said to have come from the Philippines. Petiver published Camel's description in 1705 and named the animal Cercopithecus luzonis minimus which was the basis for Linnaeus' (1758) Simia syrichta and eventually Tarsius syrichta, the scientific name it is known at present.[17] Among the locals, the tarsier is known as "mamag", "mago", "magau", "maomag", "malmag" and "magatilok-iok".[18]

According to records of the Philippine Tarsier Foundation, three subspecies are presently recognized: Tarsius syrichta syrichta from Leyte and Samar, Tarsius syrichta fraterculus from Bohol and Tarsius syrichta carbonarius from Mindanao.[19] The IUCN taxonomic notes lists two subspecies but that the non-nominate one is poorly defined as present, so the species is treated as a whole. Tarsius syrichta carbonarius and Tarsius s. fraterculus: Hill (1955) recognized these taxa as weakly defined subspecies. Niemitz (1984) found the differences to be insignificant based upon comparisons with museum specimens. Musser and Dagosto (1987) felt that the available museum specimens were insufficient to resolve the issue, but mentioned that Heaney felt that a single male tarsier from Dinagat might be distinct. Groves (2001) did not recognize subspecies of T. syrichta.[20]

[edit] Importance to humans

There is no known negative impact of the Philippine Tarsier on humans, just as long as it is in its native environment. However, when kept as pets, there is a possibility that the species may spread worms and other parasites to their human owners.

Tarsiers used to be kept as pets or sold for trade, although their survival in captivity is erratic due to their need for live insects upon which to feed. Scientists are interested in these animals because of their unique taxonomic position, and study of tarsiers may aid human economies.

[edit] Conservation

In 1986, the Philippines Tarsier was assessed as "Endangered" by the IUCN Conservation Monitoring Centre 1986. It was still assessed as "Endangered" by the IUCN Conservation Monitoring Centre in 1988, as well as in 1990 (IUCN 1990). In 1996, it was assessed as "Lower Risk/conservation dependent" by Baillie and Groombridge (1996).[21]

On September 13, 1991, the Department of Environment and Natural Resources (DENR), per DENR Administrative Order Number 48 or DAO 48, listed the Philippine Tarsier as an endangered species: species and subspecies of wildlife whose populations are in danger of extinction and whose survival is unlikely if the causal factors continue operating.[22]

The Philippine Tarsier is listed in Appendix II of CITES,[23] and the U.S. ESA classifies it as threatened.[24]

In 2000, the IUCN, having continuously listed the Philippine Tarsier as endangered,[1] further assessed the Tarsius syrichta in its red list category and criteria as "Data Deficient" (DD)[2] which means that there is inadequate information to make a direct or indirect assessment of its risks of extinction based on its distribution and/or population status. Further, it basically means that it is not known how close the species is to extinction or if it is a lower risk.

Being classified as such, the sale and trade of the species is prohibited. In addition, research on the species, particularly those using invasive techniques, is controlled by the DENR Environment Management Bureau (DENR-EMB) and requires Environmental Compliance Certificate/Environmental Impact Statement or ECC/EIS.

[edit] Threats to the species

For the past 45 million years, tarsiers have inhabited rainforests around the world, but now they only exist on a few islands in the Philippines, Borneo and Indonesia.[13] In Bohol, the Philippine Tarsier was a common sight in the southern part of the island until the 1960s. Since then, the number has dwindled to as few as an estimated 1000 still left in the wild.[citation needed] Once protected by the humid rainforests and mist-shrouded hills, these mysterious primates struggle to survive as their home is cleared for crop growing.

Due to the quickly growing human population, which causes more and more forests to be converted to farmland, housing areas and roads, the place where the Philippine Tarsier can live its secluded life is disappearing.[6]

Along this line, the dwindling of Philippine forests has posed a grave and significant threat to the survival of the Philippine Tarsier because this results in the destruction of its natural forest habitat. Indiscriminate and illegal logging, cutting of trees for firewood, "kaingin" or slash and burn method of agriculture, urbanization patterns have encroached on the habitats of the tarsier, causing the tarsier to be threatened or endangered.[25]

In addition, the unabated hunting of the species by humans for house pets or for trade has contributed to its decline. Hunting tarsiers to sell as pets was until recently, a thriving industry. Because of its adorable and benign appearance, many have been lured to keep the Philippine Tarsier as pets. This demand fuels the capture and illegal trade of the animal further diminishing its remaining number.[citation needed] Moreover, the life span is 24 years when living in the wild, but only 12 when in cages and taken care of by people. It is also known to die from psychological damage when around humans because its instinct is to be out in the wild. Moreover, its reduced life span in captivity is due to the fact that it is easily distressed by being displayed and physically handled during the day contrary to its natural biological rhythm.[citation needed]

Hunters and poachers are also big threats; not only do they kill the Philippine Tarsier, but they capture them too. Tarsiers rarely live long in captivity. It has been reported that some tarsiers were so traumatized by captivity that they committed suicide by beating their heads against the cages or drowning themselves on the drinking bowls.

Paradoxically, indigenous superstition coupled with relatively thick rainforest, particularly in Sarangani province, have apparently preserved this endangered species. Indigenous tribes leave the Philippine Tarsiers in the wild because they fear that these animals could bring bad luck. One belief passed down from ancient times is that they are pets belonging to spirits dwelling in giant fig trees, known as belete trees. If someone harms a tarsier they need to apologise to the spirits of the forest, or it’s thought they will encounter sickness or hardship in life.[13]

[edit] Conservation efforts

[edit] Legislation

Signage at entry to Philippine Tarsier Foundation Research and Development Center
Signage at entry to Philippine Tarsier Foundation Research and Development Center

Several legislations have been passed to protect and conserve the Philippine Tarsier. DENR Administrative Order No. 38, Series of 1991 (DAO No. 38) included the Philippine Tarsier among the national protected wildlife species and proposed its listing under Appendix 1 of the Convention on International Trade in Endangered Species (CITES). More over, the IUCN/SSC Primate Specialist Group had given the species Conservation Priority Rating 4, which means that the species is highly vulnerable and threatened by habitat destruction and/or hunting.

Proclamation 1030 was signed by then President of the Philippines Fidel V. Ramos on June 23, 1997, declaring the Philippine Tarsier a specially protected faunal species. [1] The Proclamation contains that since the Philippine Tarsier, endemic to the Philippines, offers immense ecological, aesthetic, educational, historical, recreational and scientific value to the country and to the Filipino people, it is a matter of national concern since it forms part of the Philippine heritage. The Proclamation thus prohibits the hunting, killing, wounding, taking away, or possession of the Philippine Tarsier, but that possession for educational, scientific, conservation-centered research purposes may be allowed upon certification of the Department of Environment and Natural Resources (DENR) Secretary. Further, the DENR is also tasked to collaborate with other concerned government agencies, NGOs, local government units and local communities in the conduct of accelerated and expanded field researches and to avail of financial support and technical cooperation from local and international entities, as may be deemed necessary to implement the provisions of the Proclamation.[26]

Republic Act No. 7586, otherwise known as the National Integrated Protected Areas System (NIPAS) Act of 1991 mandates the establishment of appropriate sanctuaries to preserve and protect the Philippine Tarsier.

There are also legislations at the other local level, including Provincial ordinances and proclamations (Bohol Province), Municipal Ordinances (Corella), Barangay Ordinances (Canapnapan, etc.).

On July 30, 2001, Philippine President Gloria Macapagal-Arroyo signed Republic Act No. 9147 otherwise known as the Wildlife Resources Conservation and Protection Act that provided for the conservation and protection of wildlife resources and their habitats, including the Philippine Tarsier, and its inclusion as a flagship species.[27]

[edit] Conservation initiatives

Conserving biological diversity involves tools like the protection of natural or semi-natural ecosystems, the restoration and rehabilitation of degraded lands, and ex-situ conservation techniques.[28] In-situ conservation is the maintenance of plant and animal genetic material in their natural habitat. The aim of in-situ conservation is to allow the population to maintain itself within the community of which it forms part and in the environment to which it is adapted so that it has the potential for continued evolution.[28] Protected areas are among the most valuable in situ conservation tool and cost-effective means for preserving genes, species, and habitats and for maintaining various ecological processes of importance to humanity. They are set aside to conserve species that cannot be preserved ex-situ and wild crop relatives. The protected areas system maintain species diversity by protecting the range of different community types and by allowing for changes in species' distributions. They do this by protecting the diversity of physical environments containing a range of situations to allow organisms to adjust their local distribution in response to climate change and linking corridors of natural and modified environments, which will allow species to change their continental distributions.[28]

Reforestation attempts to restore deforested areas using indigenous tree species are more consistent with biodiversity conservation strategies such as protected area management and natural regeneration. This allows for enhanced forest ecological services such as watershed functions, wildlife habitat, and maintenance. As a result, local biodiversity is protected and rehabilitated. In trial sites in Leyte, local fauna has been seen to quickly re-colonize the mixed plantations of rainforestation cooperators/farmers. Birds and fruit bats initially, and then larger mammals including Philippine Tarsier (Tarsius syrichta) and Flying Lemur (Cynocephahis volans) were seen in the sites after four years (Goltenhoth et al. 2000).[29]

[edit] Philippine debt-for-nature swap program

To save the Philippine Tarsier from extinction, the Philippine government has launched various initiatives. Efforts to conserve the species started in 1988 when a study on the tarsier habitat requirements was initiated in Corella, Bohol by the Parks and Wildlife Bureau or PAWB under the financial grant of the Wildlife Conservation International. This was followed by a Philippine Tarsier Project by Department of Environment and Natural Resources Region 7 in 1991-1992 under the Debt-for-Nature Swap Project.[30]

The debt-for-nature swap, first proposed by the World Wildlife Fund for Nature in 1984, is a scheme in which conservation organizations acquired title to debt, either by direct donation from a bank, or by raising the cash to buy it, and then negotiate with the debtor countries to obtain debt repayment in local currency at a favorable conversion rate, or to secure conservation measures/activities.[30]

Haribon Foundation was identified as the local NGO partner in its venture. As the local NGO partner, Haribon Foundation became the fund manager of the program, thus, all financial transactions with the Central Bank of the Philippines and the World WWF were handled while release of funds to all the projects was facilitated. One of the projects implemented on the first year was the "Endangered Species Conservation: Philippine Tarsier" supervised by the Department of Environment and Natural Resources or DENR.[31]

[edit] Philippine Tarsier Foundation Incorporated

Main article: Philippine Tarsier Foundation
PTFI Tarsier Research and Development Center, Corella,Bohol
PTFI Tarsier Research and Development Center, Corella,Bohol

The Philippine Tarsier Foundation Inc. based in Tagbilaran City, Bohol, Philippines is spearheading the campaign to preserve the Philippine Tarsier. Under a Memorandum of Agreement with the DENR signed on April 27, 1997, its mission is: to establish a forest reserve on the island of Bohol which shall serve as the sanctuary of the Philippine Tarsier; to protect and manage the tarsier sanctuary through the active participation of local communities; to establish and maintain a wildlife research laboratory for the study of the ecology and biology of the Philippine Tarsier; to establish and maintain visitor facilities for ecotourism and disseminate information material about the Philippine Tarsier with emphasis on the species' protection and conservation."[32]

To date, the Philippine Tarsier Foundation has acquired 7.4 hectares of land in Corella, Bohol for the sanctuary. With the Department of Environment and Natural Resources playing an oversight role, the foundation has asked other Bohol towns with Philippines Tarsier populations to donate 20 hectares (49.4 acres) of forestland for conservation.

It also runs a Tarsier Research and Development Center, which serves as a visitor center and venue for research, as well as a habitat preserve.[33] At the sanctuary, a spacious net enclosure keeps 100 Philippine Tarsiers for feeding, captive breeding and display. Here, visitors can observe the Philippine Tarsier in their natural habitat. Within the sanctuary, the Philippine Tarsiers roam freely and all of them have gotten used to a seven-foot high fence that circumscribes the territory and which serves mainly to protect them from predators like feral cats. At night, tarsiers can be seen climbing out of the fence to forage for food farther into the forest. They return again before daybreak, as if observing a curfew.[26]

[edit] Tarsier Sanctuary captive display

Captive tarsier display in Loboc, Bohol
Captive tarsier display in Loboc, Bohol

Because the Philippine Tarsier sanctuary in Corella, Bohol is off the tourist path,[34] private individuals in Loboc, Bohol have provided an alternative way for tourists to see them through their displays of the Philippine Tarsier along the Loboc river banks. This captive tarsier display is conveniently on the way to other tourist spots in Bohol, particularly the Chocolate Hills in Carmen town.[35] Despite the protection status of the Philippine Tarsier, the Department of Environment and Natural Resources has granted special limited permits for this display of the Philippine Tarsier in Loboc. Here, tourists can see the Philippine Tarsier up close and personal and take pictures, but are not allowed to touch them. Unfortunately, the Philippine Tarsier here are semi-captive, being kept in cages along the Loboc river. Here, the animals are not in a sanctuary and as such, these shy animals have miserable lives and normally don't survive for long.[36] Though they are allowed to leave their cages at night to hunt for food, this is contrary to the ban on possession of Philippine Tarsier by virtue of its protected status. Proclamation 1030 states that "the possession of the Philippine Tarsier is only allowed for educational, scientific, conservation-centered research purposes upon certification of the Department of Environment and Natural Resources (DENR) Secretary." Further, the possession of these tarsiers for display encourages their possession as pets.[35]

[edit] References

  1. ^ a b Groves, Colin (16 November 2005). in Wilson, D. E., and Reeder, D. M. (eds): Mammal Species of the World, 3rd edition, Johns Hopkins University Press, 128. ISBN 0-801-88221-4. 
  2. ^ a b c d Eudey, A. & Members of the Primate Specialist Group (2000). Tarsius syrichta. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 2006-05-12.
  3. ^ a b c d e f Kubicek, C. (1999). Tarsius syrichta. Animal Diversity Web. Retrieved on 2006-11-14.
  4. ^ Philippine tarsier. America Zoo. Retrieved on 2006-11-15..
  5. ^ Philippine Tarsier Foundation. Bohol Directory. Retrieved on 2006-11-11.
  6. ^ a b c Hellingman, Jeroen (2004-04-24). A Visit to the Philippine Tarsier. Bohol, Philippines. Retrieved on 2006-11-15.
  7. ^ a b c d e f Flannery, Sean (2003-10-15). Philippine Tarsier. The Primata. Retrieved on 2006-11-14.
  8. ^ a b Philippine Tarsier. Philippines Travel Guide. Retrieved on 2006-11-14.
  9. ^ The Philippine Tarsier. Comparative Mammalian Brain Collections. Retrieved on 2006-11-18.
  10. ^ a b Heaney et al. (2002). Tarsius syrichta. The Field Museum. Retrieved on 2006-11-15.
  11. ^ Jachowski, D. S., Pizzaras, C. (2003-09-10). "Introducing an innovative semi-captive environment for the Philippine tarsier (Tarsius syrichta)". Zoo Biology 24 (1): 101-109. doi:10.1002/zoo.20023 10.1002/zoo.20023. 
  12. ^ Neri-Arboleda, I., Stott, P., Arboleda, N. P. (2002-06-25). "Home ranges, spatial movements and habitat associations of the Philippine tarsier (Tarsius syrichta) in Corella, Bohol". Journal of Zoology 257 (3): 387-402. doi:10.1017/S0952836902000997 10.1017/S0952836902000997. 
  13. ^ a b c Tarsier - the littlest alien. Off The Fence. Retrieved on 2006-11-18.
  14. ^ France-Presse, A. (2004). Furry mascot of RP forest lives on borrowed time. INQ7.net. Retrieved on 2006-11-14.
  15. ^ Tarsier Truths. INQ7.net (1999-10-16). Retrieved on 2006-11-14.
  16. ^ Haring, D. M., Wright, P. C. (1988-01-05). "Hand-raising a philippine tarsier, Tarsius syrichta". Zoo Biology 8: 265-274. doi:10.1002/zoo.1430080307 10.1002/zoo.1430080307. 
  17. ^ Cabrera, Angel (May 1923). "On the Identification of Simia syrichta linnaeus". Journal of Mammalogy 4 (2): 89-91. doi:10.2307/1373538. 
  18. ^ The Philippine Tarsier www.bohol.ph Retrieved 18 November, 2006.
  19. ^ Tarsier: Tarsius syrichta www.bohol.net Retrieved 19 November 2006.
  20. ^ IUCN Red List of Threatened Species www.iucnredlist.org Retrieved 19 November, 2006.
  21. ^ The IUCN Red List of Threatened Species www.iucnredlist.org Retrieved 19 November, 2006.
  22. ^ DENR Administrative Order No. 48. North American Association for Environmental Education. Retrieved on 2006-11-18.
  23. ^ UNEP-WCMC (2005). Checklist of mammals listed in the CITES appendices and in EC Regulation 338/97 (PDF), 7th edition. Retrieved on 2006-11-18. 
  24. ^ Wilson, D. E., and D. M. Reeder (eds). (1993). Mammal Species of the World. Retrieved on 2006-11-18.
  25. ^ Querijero, D. A., (2005-04-24). RP tarsier: A new star of the biodiversity world. Retrieved on 2006-11-11.
  26. ^ a b RP Tarsier: A new star in the biodiversity world www.boholprovince.com Retrieved 14 November 2006.
  27. ^ R.A. 9147 Chan Robles Virtual Law Library Retrieved 13 December, 2006.
  28. ^ a b c Philippine Biodiversity Conservation Efforts www.bwf.org Retrieved 18 November, 2006.
  29. ^ How to bring back Philippine forests www.haribon.org.ph Retrieved 25 November, 2006.
  30. ^ a b Philippine Tarsier known to commit suicide in captivity Source: Philippine Inquirer May 31, 1999 Retrieved 25 November, 2006.
  31. ^ Haribon Projects from 1986 to 1995www.haribon.org.ph Retrieved 25 November, 2006.
  32. ^ Philippine Tarsier Foundation, Inc. Primate Info Net Retrieved 14 November, 2006
  33. ^ Furry mascot of RP forest lives on borrowed time www.inq7.net Retrieved 19 November 2006.
  34. ^ Bohol, Philippines Attractionswww.asiahotels.com Retrieved 23, November, 2006.
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