(L-R): Najin and Fatu, the two remaining Nothern White Rhino graze together in their paddock ON March 20, 2018 at the ol-Pejeta conservancy in Nanyuki. 
Sudan, the last male northern white rhino, has died in Kenya at the age of 45, after becoming a symbol of efforts to save his subspecies from extinction, a fate that only science can now prevent. / AFP PHOTO / TONY KARUMBA        (Photo credit should read TONY KARUMBA/AFP via Getty Images)