Giant panda Yang Yang looks at food in the celebration of its 20th birthday at Schonbrunn Zoo in Vienna, Austria, Aug. 9, 2020. (Daniel Zupanc/Schonbrunn Zoo/Handout via Xinhua)
Giant panda Yang Yang eats food in the celebration of its 20th birthday at Schonbrunn Zoo in Vienna, Austria, Aug. 9, 2020. (Daniel Zupanc/Schonbrunn Zoo/Handout via Xinhua)
Giant panda Yang Yang sniffs food in the celebration of its 20th birthday at Schonbrunn Zoo in Vienna, Austria, Aug. 9, 2020. (Daniel Zupanc/Schonbrunn Zoo/Handout via Xinhua)