The pit viper is 60 to 70 cm long, the head is slightly triangular, the neck is thin, the buccal fossa is clearly distinguished, the back is light brown to reddish brown, the back of the head has a dark "∧" shaped spot, the front ridge has two rows of dark brown round spots, slightly juxtaposed with each other, and there is a row of irregular black-brown thick spots on the outside of the dorsal scales and between the abdominal scales. Pit vipers are the most widely distributed and numerous poisonous snakes in China.
The black mamba snake is slender, generally more than 2 meters long, and the longest recorded can reach 4.5 meters. The head is rectangular in shape, the body color is grayish brown, and gradually becomes lighter from the dorsal ridge to the abdomen. The inside of the mouth of the black mamba snake is black, which can be clearly seen when the mouth is opened. The front of the palate can be cocked upwards when attacked, allowing its poisonous fangs to pierce objects close to the plane. It belongs to the anterior groove tooth venomous snake, the venom is neurogenic, extremely toxic.
Perhaps one of africa's deadliest snakes, the black mamba is as venomous as the golden cobra, which uses a neurotoxin that paralyzes the nervous system of its prey. On average, 10-15 mg of black mamba snake venom can kill an adult, while the amount of venom of black mamba snake is 100-120 mg, up to 200 mg, which is enough to kill 13-20 people or a giraffe weighing 600 kg, so the consequences of being bitten by a black mamba snake are quite serious, usually within an hour of being bitten, and the fastest death time can reach 15-30 minutes after being bitten.
The chameleon snake is a species of Kapuas mud snake, the first new snake species to be discovered in the past 5 years. It is a venomous snake that lives in the Kapuas River Basin in Borneo, Indonesia, in wetlands and swampy areas along rivers, and feeds mainly on rats and fish. Color-changing snakes, like most water snakes of the snake family, in addition to eating a variety of freshwater trash fish, loach, but also especially like yellow eels and various frogs, should be based on the easy to catch season or the fattening of color-changing snakes need to be fed on time, as far as possible to diversify the types of bait to meet the needs of their body growth.
The color-changing snake is one of the most poisonous of the water snakes. Its toxin is the same as that of the sea snake, but it is much smaller. Neurotoxin is a systemic agent for the nervous system, and its main feature is to inhibit the function of the nervous system, produce corresponding signs and symptoms of poisoning, and can be fatal when severe. Neurotic agents belong to the same class of compounds as common organophosphorus pesticides, and the principles of toxicity, clinical manifestations, prevention and treatment principles and first aid methods are basically similar. Although neurotoxins are often referred to as "nerve gases", they are liquid at room temperature.