Buffalos bathe in mud in Ngorongoro Crater in Ngorongoro Conservation Area, west of Arusha, northern Tanzania, Monday, January 19, 2015. According to Tanzanian officials, the crater was formed as a result of a volcanic eruption and collapsed three millions years ago and is now one of the most densely crowded African wildlife areas in the world. (Photo by Mosa'ab Elshamy/AP Photo)
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