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A Koala joey named 'Boonda' clings to his mother 'Elle' as they sit in their enclosure at Wildlife World in Sydney June 28, 2011. The zoo plans to launch a fund raising program to help conserve the iconic Australian marsupial which faces threats from habitat reduction and disease.     REUTERS/Tim Wimborne   (AUSTRALIA - Tags: ANIMALS) - RTR2O6G1 Tim Wimborne/Reuters