Endangered deer enter the wild after long recovery period

But this is not the end of their story.

Soon they will be put to the test. A water-proof GPS collar will be attached to each of them, which enables the researchers to observe their habits after being released.

In the upcoming decades, researchers will further analyze the behavior and evolution of the species with genetic tools, and their influence on the ecosystem as a flagship wetland species.

"The revival of milu in China has set a good example for species reintroduction. Our ultimate goal is to make them survive on their own. After all, they belong to nature," said Yang Sheng, director of the reserve.