Giant panda Bei Bei's favorite keeper Laurie Thompson (L) and the zoo's chief veterinarian Don Neiffer who will accompany and continuously monitor Bei Bei during the 16-hour flight are seen at the Smithsonian's National Zoo in Washington D.C., the United States, on Nov. 19, 2019. The 4-year-old giant panda Bei Bei, who was born and raised at the Smithsonian's National Zoo, departed for China on Tuesday. (Xinhua/Liu Jie)