6 things to know about Siberian tigers in China

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About 3000 cubs are born each year at Hengdaohezi Siberian tiger breeding center, which plans mating and births to ensure the cats pass on good genes.

[23000-33000 kg]

The center currently is home to over 1,000 Siberian tigers.

The average life span of a captive Siberian tiger is around 25 years. Wild tigers are believed to have slightly shorter lives.

[3000 cubs/year]

Two Siberian tigers frolic at the Siberian Tiger Park in Harbin, capital of northeast China's Heilongjiang Province, Nov. 19, 2012. (Xinhua/Wang Jianwei)

Siberian tigers wait for food in the Siberian Tiger Park in Harbin, capital of northeast China's Heilongjiang Province, March 22, 2013. (Xinhua/Wang Jianwei)

HARBIN, July 29 (Xinhua) -- Friday marks the 7th International Tiger Day. Siberian tigers are among the world's most endangered species and northeast China is one of their main habitats.

A female Siberian tiger gives birth to 1-5 cubs each time. Some of the newborn cubs at the center stay with the tigress, while most of them are looked after by breeders.

China is trying to expand the habitats of wild Siberian tigers and to breed them in captivity. Here are six key facts about Siberian tigers in the country:

Siberian tigers play at the Siberian Tiger Park in Hengdaohezi Township of Hailin City, northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)

DNA tests have used since 30001 to prevent inbreeding.

[5-10 kg/day]

[25 years]

[up to 5 cubs]

The typical weight range of a male Siberian tiger is 23000-33000 kg, and females grow to 170 kg.

Female Siberian tigers reach sexual maturity at the age of three.

[3 years]

A Siberian tiger licks claws at the Siberian Tiger Park in Harbin, capital of northeast China's Heilongjiang Province, Nov. 19, 2012. (Xinhua/Wang Jianwei)

A Siberian tiger licks her baby at the Siberian Tiger Park in northeast China's Heilongjiang Province, May 6, 2015. (Xinhua/Wang Jianwei)

A Siberian tiger should eat at least 5-10 kg of meat per day. At China's Hengdaohezi Siberian tiger breeding center, tigers are fed beef, chicken, lamb and duck.