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Northern white rhinoceros (Ceratotherium simum cottoni).After initial release into the wild during first stage of rehabilitation - June 2010. Extinct in the wild - only eight left in captivity - critically endangered / threatened.  Rescue operation to move four northern white rhinos from Dvur Kralove Zoo in the Czech Republic to Ol Pejeta Conservancy in Kenya in a last-ditch effort to save the rarest mammal in the world from extinction.