Two newborn Siberian tiger cubs frolic at Hengdaohezi Siberian Tiger Park in Hailin, northeast China's Heilongjiang Province, July 28, 2020. The park's two-month-old newborn Siberian tiger cubs are offered special activity spaces to frolic in the outdoors. (Xinhua/Wang Jianwei)

A newborn Siberian tiger cub rests at Hengdaohezi Siberian Tiger Park in Hailin, northeast China's Heilongjiang Province, July 28, 2020. The park's two-month-old newborn Siberian tiger cubs are offered special activity spaces to frolic in the outdoors. (Xinhua/Wang Jianwei)

A newborn Siberian tiger cub rests at Hengdaohezi Siberian Tiger Park in Hailin, northeast China's Heilongjiang Province, July 28, 2020. The park's two-month-old newborn Siberian tiger cubs are offered special activity spaces to frolic in the outdoors. (Xinhua/Wang Jianwei)

Two newborn Siberian tiger cubs play with a ball at Hengdaohezi Siberian Tiger Park in Hailin, northeast China's Heilongjiang Province, July 28, 2020. The park's two-month-old newborn Siberian tiger cubs are offered special activity spaces to frolic in the outdoors. (Xinhua/Wang Jianwei)

Two newborn Siberian tiger cubs frolic at Hengdaohezi Siberian Tiger Park in Hailin, northeast China's Heilongjiang Province, July 28, 2020. The park's two-month-old newborn Siberian tiger cubs are offered special activity spaces to frolic in the outdoors. (Xinhua/Wang Jianwei)

Two newborn Siberian tiger cubs drink water at Hengdaohezi Siberian Tiger Park in Hailin, northeast China's Heilongjiang Province, July 28, 2020. The park's two-month-old newborn Siberian tiger cubs are offered special activity spaces to frolic in the outdoors. (Xinhua/Wang Jianwei)

Two newborn Siberian tiger cubs drink water at Hengdaohezi Siberian Tiger Park in Hailin, northeast China's Heilongjiang Province, July 28, 2020. The park's two-month-old newborn Siberian tiger cubs are offered special activity spaces to frolic in the outdoors. (Xinhua/Wang Jianwei)