Visitors are seen at a panda shop of the Panda House in Copenhagen Zoo, Denmark, April 11, 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 Er, a 4-year-old, left the southwestern Chinese city of Chengdu on April 4 and headed to their new home at Copenhagen Zoo. (Xinhua/Guo Chen)