It is a legless reptile belonging to the snake suborder, with over 3000 different species. The body is slender and covered with scales, which help protect the skin and reduce friction. Vision is usually not very good, but they have other senses to compensate for this deficiency, such as detecting odors in the air through tongue signals and perceiving the surrounding environment by sensing ground vibrations. They have a diverse diet, some feed on small mammals, while others prey on birds, fish, or insects. Some snakes are poisonous, and they use their venomous fangs to inject venom to capture or kill their prey. Most snakes, on the other hand, are non-toxic and prey on them by coiling or swallowing

The pit viper is a reptile belonging to the family Viperidae in the order Serpentes. The body length of the pit viper is 60-70 centimeters, and its head is slightly triangular; The back is gray brown to brown, with a dark "∧" - shaped spot on the head and back, and the belly is gray white to gray brown with black spots. The pit viper, when touched, will flip over, and when bitten, people will also flip over, hence its name. The pit viper is distributed in China except for Guangdong, Hainan, and Guangxi. It often inhabits plains, hills, low mountainous areas, fields, streams, and ditches with scattered rocks or grass, and bends into a disc or wave shape. The reproduction, feeding, and activity of pit vipers are all constrained by temperature.

The Japanese pit viper (Gloydius blomhofii) is a venomous snake species belonging to the subfamily Viperinae of the family Viperidae, found in Japan. Unique species of Japan. In Japan, it is commonly referred to as "pit viper".

The rattlesnake is a reptile belonging to the family Viperidae in the order Scorpaeniformes. The body of a rattlesnake is yellow green with diamond shaped black brown spots on its back; The tail end has a series of keratin rings, which are remnants after multiple molts. When encountering enemies or rapid movements, the tail ring of the tail can quickly swing 40-60 times per second, making a loud sound for a long time, making enemies afraid to approach or scared away, hence the name.