What shape is used for drainage decoration of ancient buildings in China?

Most of the ancient buildings in China are decorated with drainage.

In the ancient buildings of China, the shape of flies is often used as the decoration of drainage outlets. One of the nine sons of the dragon in ancient myths and legends in China, who lived late or late, belongs to a kind of dragon without horns. In ancient Chinese architecture, utensils or handicrafts, its shape is often used as decoration, with a big mouth and a big belly, which can hold a lot of water. In architecture, it is often used for the decoration of drainage outlets, which is called "decapitation".