KAZIRANGA, INDIA - APRIL 13:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit the Centre for Wildlife Rehabilitation and Conservation, at Kaziranga National Park on April 13, 2016 in Guwahati, India. The Duke and Duchess of Cambridge are on a week-long tour of India and Bhutan taking in Mumbai, Delhi, Assam, Bhutan and Agra.  (Photo by Arthur Edwards - Pool/Getty Images)