The gaur (Bos gaurus; /ɡaʊər/), also known as the Indian bison, is a bovine native to South Asia and Southeast Asia, and has been listed as Vulnerable on the IUCN Red List since 1986. The global population was estimated at a maximum of 21,000 mature individuals in 2016, with the majority of those existing in India.
It is the largest species among the wild cattle and the Bovidae. The domesticated form of the gaur is called gayal (Bos frontalis) or mithun.
Being one of the largest cattle species, the gaur has a massive head, deep body, and solid limbs. The color of their body varies from reddish or brown to black while the limbs are pale colored. Both males and females have upwardly curved horns, growing from the sides of their heads. Their horns have a yellow base and black tip. These animals have a hump on their shoulders, which is especially prominent in adult males. In addition, they have a distinct "dewlap" of skin, stretching from their throat to their forelegs.
Gaurs are found throughout mainland South and Southeast Asia, including Vietnam, Cambodia, Laos, Thailand, Peninsular Malaysia, Myanmar, India, Bangladesh, Bhutan, China, and Nepal. These animals don’t migrate and live in evergreen forests or semi-evergreen and moist deciduous forests and also occur in deciduous forest areas at the periphery of their range. Gaur prefer large, relatively undisturbed forest tracts, hilly terrain, availability of water, and an abundance of forage in the form of grasses, bamboo, shrubs, and trees.
Generally, gaur are most active in the morning and evening. However, they can be active by day or even become nocturnal, when living nearby human settlements. These sociable animals gather into herds, containing 8-11 or more individuals. A gaur herd includes females and one dominant male. The home range of each herd covers about 78 sq. kilometers (30 sq. miles) territory. Bulls often congregate into bachelor herds while older males occasionally prefer living solitarily. Against a threat, the bull usually lowers its head and hind side, attacking the rival from the broadside with its horns. When alarmed, these animals give out a call known as a "whistling snort".
Gaur are herbivorous animals. Being both grazers and browsers, these bovine feed mainly upon grass while leaves, forbs, coarse and dry grasses are a good supplement to its usual diet.
Gaur have a polygynous mating system, where one male mates with a number of females. During the mating season, males give out calls of clear resonant tones, in order to attract receptive females. Meanwhile, bigger males are more successful in capturing the attention of females. They breed all year round with a peak period, lasting from December to June. Female Gaurs usually have an interval of 12-15 months between births. The gestation period lasts about 270-280 days, yielding a single baby. A newborn gaur calf weighs 23 kgs (50 Ibs) on average. At the age of 9 months, the calf is weaned and becomes reproductively mature when it is 2-3 years old.
One of the most considerable threats is the loss of habitat throughout most of their range. Another serious concern is susceptibility to domestic cattle diseases like rinderpest, hoof, or mouth disease. In addition, this animal attracts hunters for its horns and is hunted for sport.
According to the IUCN Red List, the total gaur population varies from 15,000 to 35,000 individuals. Currently, this species is classified as Vulnerable (VU) on the IUCN Red List, and its numbers today are decreasing.
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