In this photo taken Sunday, Sept. 6, 2015, hippopotamuses lie partially-submerged in the waters of Lake Ihema in Akagera National Park, eastern Rwanda. After the 1994 genocide in Rwanda, returning refugees swept into the park with herds of cattle and wiped out the last lions but now the once-abandoned reserve on the border with Tanzania is drawing more tourists, reducing poacher incursions and getting local villagers more involved in conservation - it even re-introduced lions this year. (AP Photo/Ben Curtis)
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