An otter dives into the water to cool off at the Shanghai Zoo in east China's Shanghai, July 21, 2019. Measures have been taken by the Shanghai Zoo to help its animals fend off the summer heatwave. (Xinhua/Zhang Jiansong)

Macaws cool off amid water spray fogs under sun shelters at the Shanghai Zoo in east China's Shanghai, July 21, 2019. Measures have been taken by the Shanghai Zoo to help its animals fend off the summer heatwave. (Xinhua/Zhang Jiansong)

A giant panda is given ice treat at the Shanghai Zoo in east China's Shanghai, July 21, 2019. Measures have been taken by the Shanghai Zoo to help its animals fend off the summer heatwave. (Xinhua/Zhang Jiansong)

A zookeeper sprays water for the elephants to cool off at the Shanghai Zoo in east China's Shanghai, July 21, 2019. Measures have been taken by the Shanghai Zoo to help its animals fend off the summer heatwave. (Xinhua/Zhang Jiansong)