People visit Panda Passage at Calgary Zoo in Calgary, Canada

People visit Panda Passage at the Calgary Zoo in Calgary, Canada, on July 16, 2018. After moving to the Calgary Zoo from Toronto in March, giant panda cubs Jia Panpan, Jia Yueyue, their mother Er Shun and male adult giant panda Da Mao are expected to attract lots of visitors in the summer holiday. (Xinhua/Zou Zheng)