A hippopotamus drinks water at Beijing Zoo in Beijing, capital of China, July 30, 2020. Beijing Zoo has prepared facilities to help animals fend off the summer heat in recent days. (Xinhua/Li Xin)

A giant panda eats bamboo at Beijing Zoo in Beijing, capital of China, July 30, 2020. Beijing Zoo has prepared facilities to help animals fend off the summer heat in recent days. (Xinhua/Li Xin)

A hippopotamus cub and its mother cool off at a pond in Beijing Zoo in Beijing, capital of China, July 30, 2020. Beijing Zoo has prepared facilities to help animals fend off the summer heat in recent days. (Xinhua/Li Xin)

A hippopotamus cools off at a pond in Beijing Zoo in Beijing, capital of China, July 30, 2020. Beijing Zoo has prepared facilities to help animals fend off the summer heat in recent days. (Xinhua/Li Xin)

An elephant is sprayed with water to cool down at Beijing Zoo in Beijing, capital of China, July 30, 2020. Beijing Zoo has prepared facilities to help animals fend off the summer heat in recent days. (Xinhua/Li Xin)

A giant panda cools off at Beijing Zoo in Beijing, capital of China, July 30, 2020. Beijing Zoo has prepared facilities to help animals fend off the summer heat in recent days. (Xinhua/Li Xin)