A penguin eats fish in "Zongzi" at Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 24, 2020. Zongzi is a traditional Chinese food made of glutinous rice wrapped in bamboo leaves for the occasion of Dragon Boat Festival that falls on June 25 this year. Staff members of Harbin Polarland prepared special "Fish Zongzi" to penguins. (Xinhua/Wang Jianwei)

Penguins enjoy "Zongzi" made with fish at Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 24, 2020. Zongzi is a traditional Chinese food made of glutinous rice wrapped in bamboo leaves for the occasion of Dragon Boat Festival that falls on June 25 this year. Staff members of Harbin Polarland prepared special "Fish Zongzi" to penguins. (Xinhua/Wang Jianwei)

Penguins enjoy "Zongzi" made with fish at Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 24, 2020. Zongzi is a traditional Chinese food made of glutinous rice wrapped in bamboo leaves for the occasion of Dragon Boat Festival that falls on June 25 this year. Staff members of Harbin Polarland prepared special "Fish Zongzi" to penguins. (Xinhua/Wang Jianwei)

A penguin eats "Zongzi" made with fish at Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 24, 2020. Zongzi is a traditional Chinese food made of glutinous rice wrapped in bamboo leaves for the occasion of Dragon Boat Festival that falls on June 25 this year. Staff members of Harbin Polarland prepared special "Fish Zongzi" to penguins. (Xinhua/Wang Jianwei)

A staff member feeds penguins with "Zongzi" made with fish at Harbin Polarland in Harbin, northeast China's Heilongjiang Province, June 24, 2020. Zongzi is a traditional Chinese food made of glutinous rice wrapped in bamboo leaves for the occasion of Dragon Boat Festival that falls on June 25 this year. Staff members of Harbin Polarland prepared special "Fish Zongzi" to penguins. (Xinhua/Wang Jianwei)