Zhongdong cave school is made up of six classes,
with a total of 200 children.
As well as the school,
the cave houses 18 families, together with their livestock.
These could be the only cave-dwelling cows on earth.
With schoolwork over,
it's playtime at last.
In southern China,
caves aren't just used for shelter,
they can be a source of revenue for the community.