File photo: Wardens assist the last surviving male northern white rhino named "Sudan" as it grazes at the Ol Pejeta Conservancy in Laikipia national park, Kenya June 14, 2015. (Photo/Agencies)
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File photo: Wardens assist the last surviving male northern white rhino named "Sudan" as it grazes at the Ol Pejeta Conservancy in Laikipia national park, Kenya June 14, 2015. (Photo/Agencies)
