LONDON, ENGLAND - AUGUST 24: An Asiatic lion stands to reach a bag with meat in it during a photocall to promote the London Zoo annual 'weigh-in' event. on August 24, 2017 in London, England. With more than 17,000 animals to weigh, the exercise is carried out on a regular basis by zookeepers as a way of keeping track of every animals health and wellbeing. (Photo by Dan Kitwood/Getty Images)