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The head of the Viper snakes when viewed from above, rounded-triangular in shape, anterior end blunt; in the temples it is much expanded and separated from the body of the cervical sharp interception. Eyes with vertical slit-like pupil. At the front end of the upper jaw are 2-4 long, thin motile poisonous tooth. On each maxillary bone, in addition, there are 3-4 smaller teeth substitute. They take the place of the main, if they break off a failed bite or a fall out with age. On the lower jaw and the palate there are more non-venomous small teeth, which are used for ingestion and pushing the food deeper into the mouth. The Viper snakes body is short and thick, especially in the middle part. The tail is 6-10 times shorter torso. Vipers and pit vipers snakes breed in the spring. At this time, slow in normal times, the snake becomes very active. At the meeting of two males, between them there are fights. Vipers and pit vipers – slow-moving, slow-moving snakes. During the day they mostly lay curled up, basking in the sun. Hunt at dusk. They feed on large insects and terrestrial vertebrates. Insects and small vertebrates sedentary vipers swallow immediately after the bite. If the prey is large and actively resists, then a snake crawling on the trail of the bitten animal, while focusing upon language, as if "feeling" the trail. When bitten by an animal obezdwijivanie finally, the snake creeps up and swallows the prey. Small animals, bitten by a Viper, perish in a few minutes. By the bite of a large animal and human poisoning causes a number of unpleasant symptoms: there are numerous hemorrhages in the bite site and in various organs of the body. There is severe pain, swelling, decreased heart function, appears dizziness, vomiting, in severe cases, there is loss of consciousness and death.