Bos gaurus

The gaur (/ɡaʊər/, Bos gaurus), also called the Indian bison, is the largest extant bovine. It is native to South and Southeast Asia and has been listed as Vulnerable on the IUCN Red List since 1986. The global population has been estimated at maximum 21,000 mature individuals by 2016. It declined by more than 70% during the last three generations, and is extinct in Sri Lanka and probably also in Bangladesh. In well-protected areas, it is stable and rebuilding in a few areas. It is the largest species among the wild cattle, reaching a shoulder height of up to 220 cm (87 in).In Malaysia, it is called seladang, and pyaung ပြောင် in Myanmar. The domesticated form of the gaur is called gayal (Bos frontalis) or mithun. The tallest of wild cattle species, the gaur is a strong and massively built species with a high convex ridge on the forehead between the horns, which protrudes anteriorly, causing a deep hollow in the profile of the upper part of the head. There is a prominent ridge on the back. The ears are very large; the tail only just reaches the hocks, and in old bulls the hair becomes very thin on the back. The adult male is dark brown, approaching black in very old individuals. The upper part of the head, from above the eyes to the nape of the neck, is ashy grey, or occasionally dirty white. The muzzle is pale coloured, and the lower part of the legs are pure white or tan. The cows and young bulls are paler, and in some instances have a rufous tinge, which is most marked in groups inhabiting dry and open areas. The tail is shorter than in the typical oxen, reaching only to the hocks. They have a distinct ridge running from the shoulders to the middle of the back; the shoulders may be as much as 12 cm (4.7 in) higher than the rump. This ridge is caused by the great length of the spinous processes of the vertebrae of the fore-part of the trunk as compared with those of the loins. The hair is short, fine and glossy; the hooves are narrow and pointed. The gaur does not have a distinct dewlap on the throat and chest. Both sexes have horns, which grow from the sides of the head, curving upwards. Between the horns is a high convex ridge on the forehead. At their bases they present an elliptical cross-section, a characteristic that is more strongly marked in bulls than in cows. The horns are decidedly flattened at the base and regularly curved throughout their length, and are bent inward and slightly backward at their tips. The colour of the horns is some shade of pale green or yellow throughout the greater part of their length, but the tips are black. The horns, of medium size by large bovid standards, grow to a length of 60 to 115 cm (24 to 45 in).The cow is considerably lighter in colour than the bull. Her horns are more slender and upright, with more inward curvature, and the frontal ridge is scarcely perceptible. In young animals, the horns are smooth and polished. In old bulls they are rugged and dented at the base. The gaur is the largest wild bovid alive today.It has a head-and-body length of 250 to 330 cm (8 ft 2 in to 10 ft 10 in) with a 70 to 105 cm (28 to 41 in) long tail, and is 142 to 220 cm (4 ft 8 in to 7 ft 3 in) high at the shoulder, averaging about 168 cm (5 ft 6 in) in females and 188 cm (6 ft 2 in) in males. At the top of its muscular hump just behind its shoulder, an average adult male is just under 200 cm (6 ft 7 in) tall and the male's girth at its midsection (behind its shoulders) averages about 277 cm (9 ft 1 in). Males are about one-fourth larger and heavier than females. Body mass can range widely from 440 to 1,000 kg (970 to 2,200 lb) in adult females and 588 to 1,500 kg (1,296 to 3,307 lb) in adult males. In general measurements are derived from gaurs surveyed in India. Indian gaur males averaged about 840 kg (1,850 lb) (in a sample of 13) and females weigh a median of approximately 700 kg (1,500 lb). Body masses elsewhere suggest gaurs outside of India can grow larger. In China, males weigh 1,200 kg (2,600 lb) or more. The Seladang, or Malayasian subspecies, (B. g. hubbacki) appears to be larger on average than the nominate race from India, but sample sizes as known are small. According to some sources, seladang bulls weigh on average 1,000 to 1,300 kg (2,200 to 2,900 lb), which if accurate indicates these animals are on average more than 20% more massive than the gaurs of India. Gaur historically occurred throughout mainland South and Southeast Asia, including Vietnam, Cambodia, Laos, Thailand, Peninsular Malaysia, Myanmar, India, Bangladesh, Bhutan, China and Nepal. Today, the range of the species is seriously fragmented, and it is regionally extinct in Sri Lanka. Gaur are largely confined to evergreen forests or semi-evergreen and moist deciduous forests, but also occur in deciduous forest areas at the periphery of their range. Gaur habitat is characterized by large, relatively undisturbed forest tracts, hilly terrain below an altitude of 1,500 to 1,800 m (4,900 to 5,900 ft), availability of water, and an abundance of forage in the form of grasses, bamboo, shrubs, and trees. Their apparent preference for hilly terrain may be partly due to the earlier conversion of most of the plains and other low-lying areas to croplands and pastures. They occur from sea level to an altitude of at least 2,800 m (9,200 ft). Low-lying areas seem to comprise optimal habitat. In Nepal, the gaur population was estimated to be 250–350 in the mid-1990s, with the majority in Chitwan National Park and the adjacent Parsa National Park. These two parks are connected by a chain of forested hills. Population trends appeared to be relatively stable. The Chitwan population has increased from 188 to 368 animals in the years 1997 to 2016. Census conducted in Parsa National Park confirmed the presence of 112 gaur in the same period.