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. Kenyan wildlife officials and global wildlife conservationists on Saturday converged at Ol Pejeta Conservancy in northern Kenya where a memorial service for the late world's only remaining male northern white rhino fondly named Sudan took place. (Xinhua/Lyu Shuai)
