LEWA, KENYA - MARCH 24: Prince William, Duke of Cambridge, Royal Patron of Tusk and President of United For Wildlife, lends a hand to rangers lifting the head of Kenya bull elephant  "Matt", tranquilised from a helicopter co-piloted by the Duke to allow the fitting of a new radio tracking collar on March 24, 2016 in Lewa, Kenya. This anti-poaching and research device plays a vital part of the conservation work supported by Tusk.  (Photo by Chris Jackson/Getty Images)