Giant panda Mu Yun eats bamboo at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave.

Giant panda Mu Yun drinks water at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave.

Giant panda Chu Xin rests on a tree trunk at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave. (Xinhua/Lin Hong)

Giant panda Chu Xin rests on a tree trunk at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave.

Giant panda Mu Yun eats bamboo at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave.

Giant panda Mu Yun eats bamboo at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave.

Giant pandas Chu Xin (R) and Mu Yun stay at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave. (Photos: Xinhua/Lin Hong)

Giant panda Chu Xin eats bamboo at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave.

Giant panda Chu Xin eats bamboo at the panda hall of Siberian Tiger Park in Changchun, northeast China's Jilin Province, July 23, 2019. To give giant pandas a comfortable summer, zoo authorities have adjusted their diets and built an additional resting place and pond, which help them fend off the summer heatwave.