Najin (R) and her daughter Fatu, the last two northern white rhino females, graze near their enclosure at the Ol Pejeta Conservancy in Laikipia National Park, Kenya on March 31, 2018. One of the world's last two northern white rhinos, a mother and her daughter, is being retired from a breeding program aimed at saving the species from extinction. (Photo by Thomas Mukoya/Reuters)
