The population of endangered Yunnan snub-nosed monkeys in the Yunlong Tianchi National Nature Reserve in southwest China's Yunnan Province has risen to 350, reflecting steady growth and improved habitat conditions, according to a recent ecological survey.

During the monitoring process, researchers observed that the monkey groups were in good health and highly active, even documenting their mountain-crossing routes and behaviors.

Located at the southernmost edge of the species' known range, Yunlong Tianchi is the only national nature reserve in China where the first-class protected Yunnan snub-nosed monkey is found this far south.

The species was first discovered in the region's Longma Mountain area in June 1988, when only 50 to 60 individuals were recorded. Since then, the reserve has steadily implemented an ecological corridor restoration project to connect its northern and southern sectors.

By planting spruce, armand pine, and fir,tree species favored by the monkeys,the project has created a vital bridge for population and genetic exchange, fostering a more sustainable environment for their reproduction and survival.

A joint survey conducted in November by the reserve and several research institutions confirmed that the monkey population has grown by about 300 since initial monitoring began.

"Over the past decade the monkey population has grown steadily by about 20 individuals a year. Their habitat has expanded in area and its quality has been markedly improved," said Li Yunfang, deputy head of research of the nature reserve.