Chi Wen likes swallowing things. The four beasts that swallow the ridges of the hall in the picture are all Chi Wen, so he is also called the Ridge-Swallowing Beast. He is said to be in charge of rainfall, so the design has the purpose of safeguarding palaces from fire.
Jiaotu is as tight-lipped as a mussel or a snail. His image is carved on doors.
Gong Fu likes water, so he is always carved on the holes of bridge.
This is Dragon Tortoise, his head is dragon, but body is tortoise.