Ring-tailed lemurs eat a piece of frozen fruits to cool off from hot weather at Qingdao Forest Wildlife World in Qingdao, east China's Shandong Province, July 28, 2018. (Xinhua/Yu Fangping)

A ring-tailed lemur eats a piece of frozen fruits to cool off from hot weather at Qingdao Forest Wildlife World in Qingdao, east China's Shandong Province, July 28, 2018. (Xinhua/Yu Fangping)

Hippos eat watermelon to cool off from hot weather at Qingdao Forest Wildlife World in Qingdao, east China's Shandong Province, July 28, 2018. (Xinhua/Yu Fangping)

A giant panda gets an icy treat to cool off from hot weather at Suzhou Taihu Lake National Wetland Park in Suzhou, east China's Jiangsu Province, July 27, 2018. (Xinhua/Hang Xingwei)

A giant panda gets an icy treat to cool off from hot weather at Suzhou Taihu Lake National Wetland Park in Suzhou, east China's Jiangsu Province, July 27, 2018. (Xinhua/Hang Xingwei)

Ring-tailed lemurs are fed with a piece of frozen fruits to cool off from hot weather at Qingdao Forest Wildlife World in Qingdao, east China's Shandong Province, July 28, 2018. (Xinhua/Yu Fangping)