Squirrels are our neighbors in the city, but how much do you know about them? Do you know that they eat flowers, fruits or even mushrooms? Do you know that they have ups and downs in lives just like us? 

In Beijing, we can commonly see four types of squirrels, which are Siberian chipmunks, Chinese rock squirrels, Eurasian red squirrels and Pallas's squirrels. Zhang Yu, a natural history illustrator, has observed squirrels in Beijing for over 20 years and loves recording their secret lives through drawings and photos. Watch the video to know his story with squirrels.

About Nature's Observer

Nature's Observer is a series that presents adventurous explorations into the wild led by scientists and nature lovers from around the world. By revealing the professionals' research processes and sharing their discoveries, the program aims to push us one step closer to understanding the real side of our planet.

Nature's Observer: Adventure into the fungus world

Nature's observer: Living in the backyard of real nature

Nature's Observer: Birding in Beijing

Nature's Observer: The return of the endangered relict gulls

Nature's Observer: Exploring rare plants on plateau in SW China

(Cover image designed by CGTN's Liu Shaozhen. Video directed and edited by CGTN's Zhao Ying, filmed by Wang Yue and Zhang Hengrui.)

(If you want to contribute and have specific expertise, please contact us at nature@cgtn.com.)