What did the ancients use to decorate the roofs of buildings?

Before the Han Dynasty, people often put the phoenix, peacock or suzaku at both ends of the main ridges of important buildings in China to show elegance and good luck. In the Han Dynasty, because the imperial palace was often burned by fire, Taoist priests suggested that Meretrix meretrix was a kind of fish in the East China Sea, which could spray waves and rain and put it on the roof to extinguish the fire. Therefore, when Zhang Jian Palace was completed, there was an image of a poisonous snake on the roof. Later, because of the homonym of flies and flies, people misinformed flies as flies; Because the owl's tail is in the same place as the ridge, it is gradually called "Di Kiss". After the Song Dynasty, the image of a kiss became more and more similar to the shape of a dragon, and the stinging fish evolved into a stinging beast, one of Jackie Chan's nine sons. In the Ming and Qing Dynasties, kissing changed to kissing animals, and most of the roof decorations we can see today are the products of that era. Kissing animals have different names because of their different positions on the roof. The person with the largest body at both ends of the ridge is called "positive kiss" or "big kiss"; The one on the heavy ridge is called "heavy beast"; The one on the ridge is called "Beast"; The one around the corner of the ridge is called "the horned beast". In addition, in front of heavy beasts and shovel beasts, there are often a group of wild animals, which are in the past trend and commonly known as "wild animals". They are dragon, phoenix, lion, Tianma, hippocampus, sister-in-law, gambling on fish, sister-in-law, bullfighting and walking. In front of these animals, there is often a leader who rides like a phoenix and a chicken, and is called a "fairy".