The binturong (Arctictis binturong), also known as bearcat and Palawan binturong, is a viverrid found in South and Southeast Asia. It is uncommon or rare over much of its range and listed as Vulnerable by IUCN because of a population decline estimated to be more than 30% over the last 30 years.
The body of the binturong is long and heavy, and low on the legs. It has a thick fur of strong black hair. The bushy and prehensile tail is thick at the root, gradually diminishing in size to the extremity, where it curls inwards. The muzzle is short and pointed, somewhat turned up at the nose, and is covered with bristly hairs, brown at the points, which lengthen as they diverge, and form a peculiar radiated circle round the face. The eyes are large, black and prominent. The ears are short, rounded, edged with white, and terminated by tufts of black hair. There are six short rounded incisors in each jaw, two canines, which are long and sharp, and six molars on each side. The hair on the legs is short and of a brownish tinge. The feet are five-toed, with large strong claws; the soles are bare, and applied to the ground throughout the whole of their length; the hind ones are longer than the fore.
In general build the binturong is essentially like Paradoxurus and Paguma but more massive in the length of the tail, legs and feet, in the structure of the scent glands and larger size of rhinarium, which is more convex with a median groove being much narrower above the philtrum. The contour hairs of the coat are much longer and coarser, and the long hairs clothing the whole of the back of the ears project beyond the tip as a definite tuft. The anterior bursa flap of the ears is more widely and less deeply emarginate. The tail is more muscular, especially at the base, and in colour generally like the body, but commonly paler at the base beneath. The body hairs are frequently partly whitish or buff, giving a speckled appearance to the pelage, sometimes so extensively pale that the whole body is mostly straw-coloured or grey, the young being often at all events paler than the adults, but the head is always closely speckled with grey or buff. The long mystacial vibrissae are conspicuously white, and there is a white rim on the summit of the otherwise black ear. The glandular area is whitish.
The tail is nearly as long as the head and body, which ranges from 28 to 33 in (71 to 84 cm); the tail is 26 to 27 in (66 to 69 cm) long. Some captive binturongs measured from 2 ft 6 in (76 cm) to 3 ft (91 cm) in head and body with a tail of 2 ft 4 in (71 cm). Mean weight of captive adult females is 21.9 kg (48 lb) with a range from 11 to 32 kg (24 to 71 lb). Captive animals often weigh more than wild counterparts.
Distribution and habitat
Binturongs occur from India, Nepal, Bangladesh, Bhutan, Myanmar, Thailand, Malaysia to Laos, Cambodia, Vietnam and Yunnan in China, and from Sumatra, Kalimantan and Java in Indonesia to Palawan in the Philippines.
Binturongs are confined to tall forest. They are not uncommon in the forested plains and hills throughout Assam, but more common in foothills and hills with good tree cover. They have been recorded in Manas National Park, in Dulung and Kakoi Reserved Forests of the Lakhimpur district, in the hill forests of Karbi Anglong, North Cachar Hills, Cachar and Hailakandi Districts. In Myanmar, binturongs were photographed on the ground in the Tanintharyi Nature Reserve at an altitude of 60 m (200 ft), in the Hukaung Valley at altitudes from 220–280 m (720–920 ft), in the Rakhine Yoma Elephant Reserve at 580 m (1,900 ft) and at three other sites up to 1,190 m (3,900 ft) elevation. In Thailand's Khao Yai National Park, several individuals were observed feeding in a fig tree and on a vine. In Laos, they have been observed in extensive evergreen forest. In Malaysia, binturongs were recorded in secondary forest surrounding a palm estate that was logged in the 1970s. In Palawan, they are found in primary and secondary lowland forest, including grassland–forest mosaic from sea level to 400 m (1,300 ft).
Distribution of subspecies
- A. b. binturong (Raffles, 1821) – ranges from Malacca to southwestern Thailand and Tenasserim;
- A. b. albifrons (Cuvier, 1822) – is distributed in the Eastern Himalayas to Bhutan, northern Myanmar and Indochina;
- A. b. penicillatus (Temminck, 1835) – lives in Java;
- A. b. whitei (Allen, 1910) – lives in Palawan, Philippines;
- A. b. pageli (Schwarz, 1911) – lives in Borneo;
- A. b. gairdneri (Thomas, 1916) – lives in northern Thailand;
- A. b. niasensis (Lyon, 1916) – lives in Sumatra;
- A. b. kerkhoveni (Sody, 1936) – lives in Bangka Island;
- A. b. memglaensis (Wang and Li, 1987) – is distributed in Yunnan province;
Ecology and behavior
Binturongs are active during the day and at night. Three sightings in Pakke Wildlife Sanctuary were by day. Thirteen camera trap photograph events in Myanmar involved one around dusk, seven in full night and five in broad daylight. All photographs were of single animals, and all were taken on the ground. As binturongs are not very nimble, they may have to descend to the ground relatively frequently when moving between trees.
Five radio-collared binturongs in the Phu Khieo Wildlife Sanctuary exhibited an arrhythmic activity dominated by crepuscular and nocturnal tendencies with peaks in the early morning and late evening. Reduced inactivity periods occurred from midday to late afternoon. They moved between 25 m (82 ft) and 2,698 m (8,852 ft) daily in the dry season and increased their daily movement to 4,143 m (13,593 ft) in the wet season. Ranges sizes of males varied between 0.9 km2 (0.35 sq mi) and 6.1 km2 (2.4 sq mi). Two males showed slightly larger ranges in the wet season. Their ranges overlapped between 30–70%. The average home range of a radio-collared female in the Khao Yai National Park was estimated at 4 km2 (1.5 sq mi), and the one of a male at 4.5 to 20.5 km2 (1.7 to 7.9 sq mi).
Pocock observed the behaviour of several captive binturongs in the London Zoological Gardens. When resting they lie curled up, with the head tucked under the tail. They never leap, but climb skilfully, albeit slowly, progressing with equal ease and confidence along the upper side of branches or, upside down, beneath them, the prehensile tail being always in readiness as a help, and they descend the vertical bars of the cage head first, gripping them between their paws and using the prehensile tail as a check. When irritated they growl fiercely, and when on the prowl may periodically utter a series of low grunts or a hissing sound made by expelling the air through partially opened lips.
Binturongs move about gently, often coming to a stop, and often using the tail to keep balance, clinging to a branch. They show a pronounced comfort behaviour associated with grooming the fur, shaking and licking the hair, and scratching. Shaking is the most characteristic element of comfort behaviour.
Binturong also use the tail to communicate, through the scent glands on either side of the anus in both males and females. The females also possess paired scent glands on either side of the vulva. Their musk glands emit an odor reminiscent of popcorn.
Although they are sympatric with several potential predators, including leopards, clouded leopards and reticulated pythons, predation on adults is reportedly quite rare. Normally quite shy, they can be aggressive when harassed. It is reported to initially urinate or defecate on a threat and then, if teeth-baring and snarling does not additionally deter the threat, will use its powerful jaws and teeth in self-defense.
Binturongs are omnivorous, living on small mammals, birds, fishes, earthworms, insects and fruits. Captive binturongs are particularly fond of plantains, but would also eat fowls' heads and eggs. Since they do not have the attributes of a predatory mammal, fishes and earthworms can form but an unimportant item in the food of an essentially arboreal species, which is neither aquatic nor fossorial. They also feed on rodents. Figs are a major component of their diet.
The estrous period of the binturong is 81 days, with a gestation of 91 days. The average age of sexual maturation is 30.4 months for females and 27.7 months for males. Fertility lasts until 15 years of age. The binturong is one of approximately 100 species of mammal believed by many husbandry experts to be capable of embryonic diapause, or delayed implantation, which allows the female of the species to time parturition to coincide with favorable environmental conditions. Typical birthing is of two offspring, but up to six may occur.
The maximum known lifespan in captivity is thought to be over 25 years of age.
The primary threat to the binturong is destruction of forest habitats. Although the binturong continues to occur over a large range, the populations of this species has been greatly reduced. Mostly, this is due directly to human activities. Throughout South Asia, clear-cutting of native forest is rampant. Although many areas now have treed plantations, there is no evidence that the binturong uses the plantations that are largely replacing natural forest in this region, major declines can be inferred based on decline in area of area of occupancy and habitat quality. Logging is especially epidemic as a problem for the binturong in the species range in China, where it is now considered Critically Endangered and in its range in Southeast Asia. The other primary threat to the species is direct gathering of specimens (often illegally) for the wildlife trade and hunting. Binturongs are often shot for their fur, meat and scent glands, as is common for all varieties of medium to large-sized wild mammals in its range. It is also now a fairly popular captive species.
In captivity, the binturong has been noted for its reported intelligence as well as its curious disposition and catholic diet. However, its occasional ill-temperament makes it a difficult pet at best and better handled by experienced wildlife handlers and zookeepers. The Orang Asli of Malaysia keep binturong as pets.
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