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A caretaker touches Najin, one of the world's last two remaining female northern white rhinos, in Ol Pejeta Conservancy in Laikipia county, northern Kenya, March 30, 2018. (Xinhua/Lyu Shuai)

A caretaker touches Najin, one of the world's last two remaining female northern white rhinos, in Ol Pejeta Conservancy in Laikipia county, northern Kenya, March 30, 2018. (Xinhua/Lyu Shuai)