The Siberian tiger might be an endangered species, but it is experiencing a baby boom in China's private zoos.
In the past three months, 84 cubs have been born at the Hengdaohezi nature park near Harbin, in northern China.
The success of the breeding programme there and at the country's largest park, near Guilin in southern China, has left the zoos crowded.
With more than 2,000 animals in the two parks, their owners want to be allowed to resume a trade in tiger parts, traditionally used in Chinese medicine.
The move has been vehemently opposed by conservation groups.
The Worldwide Fund for Nature says the ban is the only way to protect the wild animal from poachers.
It is feared that the numbers in the wild, mainly in India, could now be lower than 3,000. Of these, only about 400 are Siberian tigers.
In the meantime, the parks try to boost visitor numbers by allowing people to feed them live prey, which has led to further criticism.