A Northern White Rhino (Ceratotherium simum cottoni) named Sudan walks at the zoo in Dvur Kralove nad Labem in the Czech Republic December 16, 2009. Eight white rhinos live in captivity - six at the zoo in Dvur Kralove and two in the San Diego zoo - and experts believe they are among the last of the species left on the planet, as the rest of the population were killed by war and the loss of their habitat in Africa. Officials at the Czech zoo said four of the rhinos will be moved to the Ol Pejeta reservation in Kenya on Saturday in an effort to conserve the population. REUTERS/Petr Josek (CZECH

- Image ID: 2D28ET4

A Northern White Rhino (Ceratotherium simum cottoni) named Sudan walks at the zoo in Dvur Kralove nad Labem in the Czech Republic December 16, 2009. Eight white rhinos live in captivity - six at the zoo in Dvur Kralove and two in the San Diego zoo - and experts believe they are among the last of the species left on the planet, as the rest of the population were killed by war and the loss of their habitat in Africa. Officials at the Czech zoo said four of the rhinos will be moved to the Ol Pejeta reservation in Kenya on Saturday in an effort to conserve the population. REUTERS/Petr Josek (CZECH

REUTERS / Alamy Stock Photo

Image ID: 2D28ET4

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