Siberian tigers are seen at Hengdaohezi Siberian tiger park in Hailin City, northeast China's Heilongjiang Province, July 27, 2020. There are now over 400 Siberian tigers at the park. July 29 marks the International Tiger Day. Photo:Xinhua

Siberian tigers are seen at Hengdaohezi Siberian tiger park in Hailin City, northeast China's Heilongjiang Province, July 27, 2020. There are now over 400 Siberian tigers at the park. July 29 marks the International Tiger Day. Photo:Xinhua

Siberian tigers are seen at Hengdaohezi Siberian tiger park in Hailin City, northeast China's Heilongjiang Province, July 27, 2020. There are now over 400 Siberian tigers at the park. July 29 marks the International Tiger Day. Photo:Xinhua

Siberian tigers are seen at Hengdaohezi Siberian tiger park in Hailin City, northeast China's Heilongjiang Province, July 27, 2020. There are now over 400 Siberian tigers at the park. July 29 marks the International Tiger Day. Photo:Xinhua

Siberian tigers are seen at Hengdaohezi Siberian tiger park in Hailin City, northeast China's Heilongjiang Province, July 27, 2020. There are now over 400 Siberian tigers at the park. July 29 marks the International Tiger Day. Photo:Xinhua

Siberian tigers are seen at Hengdaohezi Siberian tiger park in Hailin City, northeast China's Heilongjiang Province, July 27, 2020. There are now over 400 Siberian tigers at the park. July 29 marks the International Tiger Day. Photo:Xinhua