GUANGZHOU, CHINA - OCTOBER 31: Polar bear 'Pizza' at an aquarium in Grandview shopping mall on October 27, 2016 in Guangzhou, China. 'Pizza' is the only live polar bear in south China's Guangzhou,once interference by foreign institutions but was rejected. He has become known as the world's saddest polar bear. (Photo by Zhong Zhenbin/Anadolu Agency/Getty Images)
