Twenty-seven-year-old female giant panda Bai Yun eats bamboo in San Diego Zoo in San Diego, the United States, April 6, 2019. Female giant panda Bai Yun and her son, six-year-old Xiao Liwu, will leave the zoo in late April and be sent back to China, as the zoo's conservation loan agreement with China has ended. (Xinhua/Li Ying)