KAZIRANGA, INDIA - APRIL 13:  An Indian elephant flaps its ears as Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge prepare to leave on a safari  in Kaziranga National Park on day 4  of the royal visit to India and Bhutan on April 13, 2016 in Kaziranga, 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 Chris Jackson/Getty Images)