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The water buffalo or domestic Asian water buffalo (Bubalus bubalis) is a large buffalo found on the Indian subcontinent to Vietnam and Peninsular Malaysia, in Sri Lanka and in Borneo. Water buffaloes are especially suitable for tilling rice fields, and their milk is richer in fat and protein than of the dairy cow. The large feral population of northern Australia became established in the late 19th century, and there are smaller feral herds in New Guinea, Tunisia and northeastern Argentina. Two groups have been described, termed Swamp and River types.
There are at least 130 million domestic water buffalo, and more human beings depend on them than on any other domestic animal.The wild water buffalo (Bubalus arnee) native to Southeast Asia is considered a different species that is listed as Endangered in the IUCN Red List since 1986, as the remaining global wild population totals less than 4,000 individuals, with an estimate of fewer than 2,500 mature individuals. The population decline of at least 50% over the last 24–30 years is projected to continue.
It most likely represents the ancestor of the domestic water buffalo.Water buffaloes were domesticated in India some 5000 years ago, and in China 4000 years ago. Two types are recognized, based on morphological and behavioural criteria – the river buffalo of the Indian subcontinent and further west to the Balkans and Italy, and the swamp buffalo, found from Assam in the west through Southeast Asia to the Yangtze valley of China in the east.
The origin of the domestic water buffalo is still an open question. Results of a phylogenetic study indicate that the swamp water buffalo may have originated in China, while the river water buffalo originated from India
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