Gaur

• 1. Introduction

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  The gaur, known in scientific literature as Bos gaurus, can weigh up to 1,500 kg and stand nearly 200 cm tall at the shoulder. That makes it the largest living member of the entire bovid family, outpacing every other wild cattle species on Earth. Yet most people outside South and Southeast Asia have never heard of it. How does the biggest wild bovine on the planet remain so little known? And why, as of 2016, have its numbers across Indochina and Malaysia collapsed by more than 70 percent in just three generations?

• 2. Built Like a Fortress

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  A bull gaur's girth behind the shoulders averages around 277 cm. That figure alone begins to explain why so few predators will take one on. The gaur carries a dramatic muscular hump over its shoulders, caused by the exceptional length of the spinal processes of the vertebrae in the front portion of the trunk. The shoulders can sit as much as 12 cm higher than the rump, giving the animal its characteristic silhouette.

  The horns grow from the sides of the head and curve upward, ranging from 60 to 115 cm in length. They are pale green or yellow along most of their length, turning black at the tips. Both sexes carry them, though the cows' horns are more slender and more upright. Between the horns sits a high convex ridge on the forehead, one of the gaur's most distinctive features.

  Coloration also marks age and sex. Old bulls can be nearly black, while the upper forehead shades to ashy grey. The lower legs are pure white or tan, giving the impression of a massive dark animal standing in pale stockings. Young cows and juveniles are paler still, sometimes carrying a reddish tinge that is most pronounced in herds living in dry, open landscapes.

  Body mass ranges from 440 to 1,000 kg in adult females and from 588 to 1,500 kg in adult males. In a sample of 13 individuals surveyed in India, males averaged around 1,500 kg. The gaur's head-and-body length runs from 250 to 330 cm, and its tail reaches only to the hocks, shorter than the tails of typical oxen.

• 3. Range and Refuge

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  Historically, the gaur stretched across all of mainland South and Southeast Asia, from Nepal and India through Thailand, Cambodia, Vietnam, Laos and into China as far north as the 34th parallel during the late Neolithic period, roughly 5,200 years ago. Today its range is seriously fragmented. It is regionally extinct in Peninsular Malaysia and Sri Lanka.

  The Western Ghats of southern India remain one of the most important strongholds. The Wayanad-Nagarhole-Mudumalai-Bandipur complex holds major populations, with roughly 2,000 individuals recorded in both Nagarahole and Bandipur National Parks. Tadoba Andhari Tiger Project supports over 1,000 individuals. In Nepal, the Chitwan National Park population grew from 188 animals in 1997 to 368 in 2016, a rare bright point in the overall picture.

  In China, the species once ranged widely but is now confined to heavily fragmented populations in Yunnan and southeastern Tibet. The population in Yunnan's Xishuangbanna National Nature Reserve may have held 600-800 individuals in the mid-1990s, but the broader trend has been contraction and local extirpation.

  Cambodia illustrates the regional decline sharply. In Keo Seima Wildlife Sanctuary, line-transect surveys counted around 500 individuals in 2010; by 2020, that figure had fallen to just 33. Encounter rates in Sre Pok and Phnom Prich Wildlife Sanctuaries were similarly bleak by 2020, with observers sighting between zero and five animals per 10 km transect. The global population was estimated at a maximum of 21,000 mature individuals in 2016, prompting the IUCN to list the gaur as Vulnerable, a status it has carried since 1986.

• 4. Social Life and Daily Rhythms

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  Gaur herds are led by an old adult female, the matriarch. In January and February, the typical herd holds between eight and 11 individuals, with one bull among them. As the breeding season builds toward April and May, additional bulls move in, and individual males may travel from herd to herd, each mating with multiple cows before departing in May or June to form all-male groups or live alone.

  Where human disturbance is minimal, gaur are largely diurnal. In areas under pressure from people, they shift their activity toward the night. In central India, herds are rarely seen in open ground after 8 o'clock in the morning. Herds wander between 2 and 5 km each day, and individual home ranges overlap freely. Occasionally, multiple herds join to form temporary aggregations of 50 or more animals.

  Despite their bulk, gaur can crash into dense jungle at surprising speed when alarmed. Their alarm call is a high, clear whistle. Bulls produce a mating call of resonant tones audible for more than 1.6 km. No serious fighting between males has been documented; dominance is settled largely by size rather than by combat.

  The wet and dry seasons shape how herds use the landscape. During the dry season, groups gather in concentrated areas near water sources. With the arrival of the monsoon, they disperse into the hills. Gaur drink regularly but, unlike many other large bovines, do not bathe or wallow.

• 5. What the Gaur Eats

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  During a survey at Bhagwan Mahaveer Sanctuary and Mollem National Park, researchers recorded gaur feeding on 32 distinct plant species. The gaur browses the upper portions of plants, including leaf blades, stems, seeds and flowers, and shows a high preference for leaves and the fruit of elephant apple, known botanically as Dillenia.

  Season governs what the gaur eats. In winter and the monsoon, it favors fine fresh grasses and legumes, including tick clover (Desmodium triflorum), and browses shrubs such as karvy (Strobilanthes callosus), Indian boxwood (Gardenia latifolia) and the chaste tree (Vitex negundo). In summer, as green grass dries up, it turns to teak bark (Tectona grandis) and the fruit and bark of cashew (Anacardium occidentale).

  Teak bark is not a fallback of desperation alone. Researchers have measured calcium concentrations of 22,400 ppm and phosphorus concentrations of 400 ppm in teak bark, suggesting that debarking helps gaur meet specific mineral needs as well as caloric ones. Peak feeding activity occurs in two windows each day: between 6:30 and 8:30 in the mornings and between 17:30 and 18:45 in the evenings. During the hottest midday hours, herds rest in the shade of large trees.

  The survival of the gaur is tied directly to the availability of its preferred plant species. Protecting the historically used forest habitats is, by extension, a significant factor in the conservation of the species.

• 6. Predators and Self-Defence

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  Only two predators have been reliably documented killing healthy adult gaur: tigers and saltwater crocodiles. Leopards, dhole packs and large mugger crocodiles occasionally take unguarded calves or sick animals, but they rarely attempt a fully grown bull. A saltwater crocodile would likely need to be a mature male exceeding 3.7 m in length and 300 kg in weight to have any reasonable chance against a healthy adult.

  Tigers hunt young or infirm gaur far more often than they take adults, but cases of tigers killing bulls weighing at least 1,000 kg have been recorded. When a tiger is detected, adult gaur close ranks. The herd forms a circle with the calves and young in the centre. Since tigers rely on ambush, they will almost always abandon a hunt once the element of surprise is lost. A herd in Malaysia once encircled a calf that a tiger had already killed and held the predator away from the carcass entirely.

  Gaur are also capable of killing tigers in direct defense. In regions of India where human presence is rare, gaur are described as genuinely timid despite their size. In parts of South India and Southeast Asia where they have grown accustomed to people, the opposite is true. Locals describe them as bold and sometimes aggressive. Bulls may charge without provocation, especially in summer, when heat and parasitic insects sharpen their tempers.

• 7. Domestication and Cloning

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  The gaur's domesticated relative, the gayal or mithun, originated partly from the wild gaur. It is most common in the border regions of Northeast India, specifically Assam, Manipur and Nagaland, as well as in Bangladesh, where it overlaps with Myanmar and Yunnan, China.

  On the 8th of January 2001, a different kind of reproduction took place at Trans Ova Genetics in Sioux Center, Iowa. The world's first cloned gaur was born there, carried to term by a surrogate domestic cow, Bos taurus. The calf appeared healthy at birth. Within 48 hours it died, from a common dysentery that investigators concluded was most likely unrelated to the cloning process itself.

  The gaur is listed in CITES Appendix I, the highest level of trade protection, and is legally protected across all of its range states. Sexual maturity arrives in the second or third year. Gestation runs about 275 days, a few days shorter than in domestic cattle. Calves are typically weaned between seven and 12 months. A gaur in captivity can live up to 30 years. The species' conservation hinges on both those long-term captive records and the continued protection of the forested hill landscapes where wild herds still roam.