The park, which covers more than 1.4 million hectares, is the most important habitat and breeding area for wild Siberian tigers and Amur leopards in China.

Data from the park shows that there are more than 50 Siberian tigers and over 60 Amur leopards in the area, and the survival rate of Siberian tiger cubs has increased from 33 percent before the establishment of the park in 2016 to 50 percent this year. Over 5,000 infrared cameras have been set up to record the living conditions of wild tigers and leopards in the Hunchun administrative region, which has an area of 275,968 hectares.

"We need to get photos of a tiger's left and right sides to make sure that it is the same one," she says. "Sometimes, I can identify a tiger within one day, but sometimes it takes over half a year."

The Siberian tigers' "ID cards "come with a lot of information, including the animals' activity areas, food chain and mating conditions — important basic data that aids scientific conservation.

Based on such information, Duan draws the family trees of the tigers.

"In recent years, we have seen a remarkable increase in the variety and number of wild animals, thanks to improved conservation efforts," she says. "I can find more tiger families, including some back two or three generations.

"I feel quite honored to be involved in wildlife conservation," she says. "I hope humans and wild animals can live in harmony to create a more beautiful world."

Contact the writers at zhouhuiying@chinadaily.com.cn