Animal keeper Nicole MacCorkle holds Bei Bei, the National Zoo's newest panda and offspring of Mei Xiang and Tian Tian, for members of the media at the National Zoo, Dec. 14, 2015, in Washington. (AP Photo/Andrew Harnik, File)
Bei Bei, a male giant panda, born in Smithsonian's National Zoo in the U.S. in 2015 and returned to China in 2019, eats bamboo at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Ya'an, southwest China's Sichuan Province, Monday, June 12, 2024. (AP Photo/Caroline Chen)
Male Giant Panda, Mei Sheng born in San Diego Zoo (US) in 2003 and returned to China in 2007, eats bamboo under a hut at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Ya'an, southwest China's Sichuan Province, Monday, June 12, 2024. (AP Photo/Caroline Chen)
Giant Pandas Ling-Ling and Hsing-Hsing move around in their enclosure at the National Zoo in Washington in May 6, 1975. Beijing gifted the pair of pandas to the U.S. following President Richard Nixon's historic visit to China in 1972 and then to countries such as Japan, France, the U.K., and Germany over the next decade. (AP Photo/Bob Daugherty, File)
Female Giant Panda Xiang Xiang, born in Japan's Ueno Zoo in 2017 and returned to China in 2023 enjoys a birthday treat at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Ya'an, southwest China's Sichuan Province, Monday, June 12, 2024. (AP Photo/Caroline Chen)
Bei Bei, a male giant panda, born in Smithsonian's National Zoo in the U.S. in 2015 and returned to China in 2019, eats bamboo at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Ya'an, southwest China's Sichuan Province, Monday, June 12, 2024. (AP Photo/Caroline Chen)
Female Giant Panda Ran Ran positions herself to nurse her cub at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Ya'an, southwest China's Sichuan Province, Monday, June 12, 2024. (AP Photo/Caroline Chen)
FILE- The National Zoo's giant pandas, Ling-Ling and Hsing-Hsing, play in their yard in Washington, April 20, 1974. Beijing gifted the pair of pandas to the U.S. following President Richard Nixon's historic visit to China in 1972 and then to countries such as Japan, France, the U.K., and Germany over the next decade. (AP Photo/Charles Tasnadi, File)
This combination photo shows Bei Bei in Dec 14, 2015 at the National Zoo in Washington and Bei Bei in June 12, 2024 at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Ya'an, southwest China's Sichuan Province. (AP Photo/Andrew Harnik, AP Photo/Caroline Chen)
Male Giant Panda, Mei Sheng born in San Diego Zoo (US) in 2003 and returned to China in 2007, eats bamboo under a hut at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Ya'an, southwest China's Sichuan Province, Monday, June 12, 2024. (AP Photo/Caroline Chen)
Visitors take photos and video of female Giant Panda Xiang Xiang, born in Japan's Ueno Zoo in 2017 and returned to China in 2023, at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Ya'an, southwest China's Sichuan Province, Monday, June 12, 2024. (AP Photo/Caroline Chen)
Panda Mei Xiang yawns as she rests in her pen on a hot sunny day, June 7, 2007, at the National Zoo in Washington. (AP Photo/Ron Edmonds, File)