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You may already know that yaks are those woolly, mountainous beasts that resemble a mix between a cow, a bison, and a mammoth. Despite its lumbering appearance, wild yaks (Bos mutus) make a good living in their Himalayan home. They are generally solitary and will often run for miles if they sense a human approaching. However, yaks themselves are actually quite gentle in nature. If they feel threatened, a yak may make a false charge, which is much like playing the classic game of "chicken" where the yak will drift to the side at the last moment, avoiding collision.
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Although I have been writing about wild yaks, domesticated yaks are widely used in Tibet as pack animals. They do the job quite well because they survive on less that 1% of their body mass each day (a cow requires 3%), and unlike a cow, a yak will not eat grain but must forage for grass. The Tibetans will burn yak dung for fuel. Also, in Tibet, there is a distinction between a male yak (called a "yak") and a female yak (called a "nak").
And, just because yaks are so fun, there is such a sport as yak skiing. It has a simple layout whereby you have a skier at the bottom of a slope and a yak at the top. The two are tied together via a pulley system that runs up the side of the mountain. The skier will shake a bucket filled with pony nuts (a delicacy among yaks), and the yak will come barreling down the slope, sending the skier shooting to the top. I would assume this ends with the skier skiing back down the hill while the yak wanders back up.