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With only two captive females remaining, the Northern White Rhino is functionally extinct. Now scientists have created embryos of hybrid Northern/Southern white rhinos. Jan Stejskal, Director of International Projects at Dvur Kralove Zoo, Czech Republic, and Prof Thomas Hildebrandt, who’s based at the Leibniz Institute for Zoo and Wildlife Research in Berlin, explain what it would take to save the species. (Image: Two female Northern White Rhinos, Credit: AFP/Getty Images.)