Introduction to Birds Returning to Nest: There is a huge stone wall on the roadside at the west entrance of Tonggubao Scenic Area. The stone wall is wrapped with vines and green trees, which looks like a natural painted screen. It is called Painted Screen Rock. There are many sharp rocks at the front and top of the stone wall, which look like a flock of birds resting in the trees, hence the name "Flock of Birds Returning to their Nests".