article_snippet: Last July, Li Weidong spotted and photographed the elusive creature for the first time since the early 1990s.
article_snippet: I discovered the species, and I watched as it became endangered," Li Weidong told CNN.
article_snippet: If it becomes extinct in front of Li Weidong, I'll feel so guilty.
article_snippet: The mammal, only 20 centimeters long, lives on sloping bare rock faces and feeds on grasses at high elevations.
article_snippet: In 1983, when Li Weidong first came across the mammal, nobody knew what the mammal was.
article_snippet: Two years later, Li Weidongfound another two and Li Weidong was declared a new species.
article_snippet: This tiny species could be extinct any time," Li Weidong said.
article_snippet: This tiny species don't exist in the sites where This tiny species used to be anymore.
highlights_snippet: It was photographed for the first time in two decades last year .