Queen Margrethe II (3rd L), Chinese ambassador to Denmark Deng Ying (5th L), and several representatives from both sides attend the ceremony at the Copenhagen zoo in Copenhagen, Denmark, on April 10, 2019. Danish Queen Margrethe II officially opened the Panda House at Copenhagen Zoo on Wednesday. Male Xing Er, a 5-year-old, and female Mao Sun(Mao Er), a 4-year-old, left the southwestern Chinese city of Chengdu on April 4 and headed for their new home at Copenhagen Zoo. (Xinhua/Guo Chen)