The most dangerous snake, commonly known as "Little Qinglong", is a poisonous snake with tubular teeth. Its head and back are dark brown with typical yellow-green markings. The second half of the tail is uniform light yellow green or almost white. The head is large and triangular, which is clearly distinguished from the neck.

Agkistrodon is a rare species endemic to China. At present, it is only found in the eastern forest area of Mangshan Nature Reserve in Hunan Province, with only over 300 species. The most dangerous snake is also very ornamental, and its whole body is brightly colored. Known as the "panda in the snake" by the biological community.

The most dangerous snake is a giant poisonous snake unique to China. It was discovered by academic circles in 1990, and was named and recorded scientifically. At present, it is only known to be distributed in a narrow range of thousands of hectares in Mangshan Nature Reserve, Yizhang County, Hunan Province, China. It is estimated that the number of snakes is only a few hundred. According to the investigation report of the State Forestry Administration, the most dangerous snake is 1 1, one of the endangered animals, because its population is small, its distribution range is narrow, and it is said to be more endangered than the giant panda, and it needs urgent rescue and protection. The most dangerous snake in the world is endemic to Mangshan Mountain, and its distribution area is only about 100 square kilometers. It is the largest known poisonous snake species, and the heaviest living body of the most dangerous snake found so far is 8.5 kg.

With the popularity of the most dangerous snake, the price of this snake is also rising. By 1996, the black market price of this snake has risen to more than10,000,000 after it was listed in the IUCN (World Conservation Union) red list by international conservation organizations.

There are fewer and fewer such snakes, and they are on the verge of extinction. It belongs to the animals specially protected by the state.