Giant panda Qing Bao plays during her fourth birthday's celebration at the Smithsonian's National Zoo in Washington, D.C., the United States, on Sept. 12, 2025. (Xinhua/Hu Yousong)

Giant panda Qing Bao plays with birthday gifts during her fourth birthday's celebration at the Smithsonian's National Zoo in Washington, D.C., the United States, on Sept. 12, 2025. (Xinhua/Hu Yousong)

Giant panda Qing Bao eats the birthday cake during her fourth birthday's celebration at the Smithsonian's National Zoo in Washington, D.C., the United States, on Sept. 12, 2025. (Xinhua/Hu Yousong)

Giant panda Qing Bao plays with birthday gifts during her fourth birthday's celebration at the Smithsonian's National Zoo in Washington, D.C., the United States, on Sept. 12, 2025. (Xinhua/Hu Yousong)

Giant panda Qing Bao plays with birthday gifts during her fourth birthday's celebration at the Smithsonian's National Zoo in Washington, D.C., the United States, on Sept. 12, 2025. (Xinhua/Hu Yousong)