A staff member feeds zongzi (traditional Chinese glutinous rice dumplings) to the hippo at Zhengzhou Zoo in Henan Province, June 9, 2021. (Photo: China News Service/Li Chaoqing)

Monkeys enjoy special zongzi at Zhengzhou Zoo in Henan Province, June 9, 2021. (Photo: China News Service/Li Chaoqing)

A staff member feeds zongzi to elephants at Zhengzhou Zoo in Henan Province, June 9, 2021. (Photo: China News Service/Li Chaoqing)

Monkeys enjoy zongzi on a tree stump at Zhengzhou Zoo in Henan Province, June 9, 2021. (Photo: China News Service/Li Chaoqing)