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Yak (Bos grunniens), shaggy ox of the high plateau of Tibet. Yaks are distinguished by the long fringe of hair on shoulders, flanks, thighs, and tail, and the long in-curved horns. Wild yaks are large animals, up to 7 ft (2.1 m) at the shoulder, with black coats. Domestic yaks, kept as beasts of burden and for their milk, are smaller and may be any of several colors.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Willamette River to Yaoundé