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The appearance of the dinosaur is unique. The humerus has a low triangular crest, which is about 1/3 to 1/2 of the length of the humerus. There is a protruding area at the rear of the intestine. The end edge of the tibia is broad and has a backward flange. The talus has an obvious upward process that fits the tibia. Dinosaurs have an upright gait, while most other reptiles have a gait with their limbs extended to the sides. The body shape of dinosaurs is also very special. They are generally very large, among which sauropods are the giants. In particular, the largest sauropods were several orders of magnitude larger than any other animal, but most dinosaurs were much smaller than the large sauropods. During the long dinosaur era, even the smallest sauropods were larger than other animals in their habitat. There are many species of dinosaurs, probably more than 1,000 species, but according to the different structures of the hips, they can all be classified into two major categories: saurischians and ornithischians, and these two categories are divided into several smaller categories. Saurishense dinosaurs are divided into animal feet and sauropods, and ornithischians are divided into bird feet, sword spines, scales, tentacles, swollen heads, etc. In order to help readers understand the knowledge of dinosaurs, this book is based on the latest research data at home and abroad, and under the guidance of relevant experts, specially edited content including theropods, sauropods, ornithopods, stegopods, squamata, tentacles, squamata, etc.