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LONDON, ENGLAND - MARCH 17: Prince Philip, Duke of Edinburgh opens The 'Land Of The Lions' Exhibit at London Zoo on March 17, 2016 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - MARCH 17:  Prince Philip, Duke of Edinburgh opens The 'Land Of The Lions' Exhibit at London Zoo on March 17, 2016 in London, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)