Siberian tiger cubs have fun at a forest park under the China Hengdaohezi Feline Breeding Center in northeast China's Heilongjiang Province, July 29, 2022. Tourists came to the China Hengdaohezi Feline Breeding Center in Hailin City on Friday in a way to observe the annual International Tiger Day, also known as Global Tiger Day, which falls on July 29. Photo:Xinhua

A Siberian tiger rests on a rock at the feralization training area under the China Hengdaohezi Feline Breeding Center in northeast China's Heilongjiang Province, July 29, 2022. Tourists came to the China Hengdaohezi Feline Breeding Center in Hailin City on Friday in a way to observe the annual International Tiger Day, also known as Global Tiger Day, which falls on July 29. Photo:Xinhua

Siberian tiger cubs are seen at a forest park under the China Hengdaohezi Feline Breeding Center in northeast China's Heilongjiang Province, July 29, 2022. Tourists came to the China Hengdaohezi Feline Breeding Center in Hailin City on Friday in a way to observe the annual International Tiger Day, also known as Global Tiger Day, which falls on July 29. Photo:Xinhua

A Siberian tiger cub frolics at a forest park under the China Hengdaohezi Feline Breeding Center in northeast China's Heilongjiang Province, July 29, 2022. Tourists came to the China Hengdaohezi Feline Breeding Center in Hailin City on Friday in a way to observe the annual International Tiger Day, also known as Global Tiger Day, which falls on July 29. Photo:Xinhua

A Siberian tiger rests on a rock at the feralization training area under the China Hengdaohezi Feline Breeding Center in northeast China's Heilongjiang Province, July 29, 2022. Tourists came to the China Hengdaohezi Feline Breeding Center in Hailin City on Friday in a way to observe the annual International Tiger Day, also known as Global Tiger Day, which falls on July 29. Photo:Xinhua

A Siberian tiger rests at the feralization training area under the China Hengdaohezi Feline Breeding Center in northeast China's Heilongjiang Province, July 29, 2022. Tourists came to the China Hengdaohezi Feline Breeding Center in Hailin City on Friday in a way to observe the annual International Tiger Day, also known as Global Tiger Day, which falls on July 29. Photo:Xinhua

Tourists watch Siberian tiger cubs at a forest park under the China Hengdaohezi Feline Breeding Center in northeast China's Heilongjiang Province, July 29, 2022. Tourists came to the China Hengdaohezi Feline Breeding Center in Hailin City on Friday in a way to observe the annual International Tiger Day, also known as Global Tiger Day, which falls on July 29. Photo:Xinhua

Two Siberian tigers interact with each other at the feralization training area under the China Hengdaohezi Feline Breeding Center in northeast China's Heilongjiang Province, July 29, 2022. Tourists came to the China Hengdaohezi Feline Breeding Center in Hailin City on Friday in a way to observe the annual International Tiger Day, also known as Global Tiger Day, which falls on July 29. Photo:Xinhua