According to Tencent's video query, in the cartoon "How to Train Your Dragon", the skin color of "nightmare" is red and black, black is more common, the eyes are yellow and huge, and the beak is similar to a crocodile. It is a rare, most dangerous and intelligent night dragon among dragons, but it is petite, smart and lovely, and has a rich expression. It is nothing like the legendary devil, and it is very loyal to its friend Hikarp. It can be said that it is a rare dragon in foreign movies.