Children wave panda toys to welcome giant panda Yuan Yuan at the Schoenbrunn Zoo in Vienna, Austria, on May 20, 2019. Giant panda Yuan Yuan was officially handed over to the zoo in a grand ceremony on Monday morning. Yuan Yuan is a 19-year-old male who has been in Vienna since mid-April and quarantined for a month before visitors could take a look at him. (Xinhua/Guo Chen)