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SYDNEY, AUSTRALIA - APRIL 20: Prince George of Cambridge holds a toy Bilby during a visit to Taronga Zoo on April 20, 2014 in Sydney, Australia. The Duke and Duchess of Cambridge are on a three-week tour of Australia and New Zealand, the first official trip overseas with their son, Prince George of Cambridge. (Photo by Chris Jackson/Getty Images)

SYDNEY, AUSTRALIA - APRIL 20:  Prince George of Cambridge holds a toy Bilby during a visit to Taronga Zoo on April 20, 2014 in Sydney, Australia. The Duke and Duchess of Cambridge are on a three-week tour of Australia and New Zealand, the first official trip overseas with their son, Prince George of Cambridge.  (Photo by Chris Jackson/Getty Images)