The hemispherical cage contains such ornamental birds as warbler, swallow and peacock. It is also located in the canyon, so it is named "Yingyan Canyon". The cage is made up of steel bars connected by longitude and latitude. The center of the cage is supported by a pillar. The net covers the surface of the sphere. The height of the central pillar is 10 meters, and the radius of the bottom is 12 meters. If you pass by here, you may as well stop and listen. From time to time, there are one or two melodious birdsong in the quiet valley, which makes you feel very comfortable. You can appreciate the quiet artistic conception of "mountain birds come out of the moon, and sing in the spring stream".