Snakes treat a suborder of reptiles, are very numerous and exist on all continents except for only Antarctica. It is considered to be that at snakes weak sight and hearing. Despite this fact, at the moment it is one of the most successful types of hunters.
Sight of a snake
Fairly speaking, snakes are not so blind as it is considered to be. Their sight strongly varies. For example, wood dragons have rather acute eyesight, and leading an underground life are capable to distinguish light from darkness only. But on the whole they are really weak-sighted. And in the period of a molt in general can during hunting miss. This results from the fact that the surface of an eye at a snake is covered with a transparent cornea and at the time of a molt also separates, and eyes grow turbid.
However the lack of vigilance of a snake is compensated by the body of thermal sensitivity allowing them to keep track of heat radiated by production. And some representatives of reptiles are even capable to trace the direction of a source of heat. This body was called a thermolocator. In fact he allows a snake "to see" production in an infrared range and to hunt successfully even at night.
Hearing of a snake
Concerning hearing statement that snakes of deafs, fairly. They have no external and middle ear and only internal is developed almost completely. Instead of an organ of hearing the nature presented to snakes high vibration sensitivity. As they all over adjoin to the earth, very sharply feel the slightest vibrations. However, sounds of a snake after all perceive, but in very low frequency range.
Sense of smell of a snake
Principal organ of feelings of snakes is them surprisingly the keen sense of smell. Interesting nuance: at immersion in water or at a zaryvaniye in sand both nostrils are densely closed. And that it is even more interesting - in the course of sense of smell the long language doubled on the end is directly involved. At a close mouth he leans out outside through semicircular cutting in the upper jaw, and during swallowing hides in a special muscular vagina. Frequent vibrations of language of a dragon takes microscopic particles of odorous substances as if takes sample, and sends them to a mouth. There it presses language to two poles in the top sky - to body of Jacobson which consists of chemically active cages. This body gives a snake chemical information on the events around, helping it to find production or in time to notice a predator. It should be noted that at the snakes living in water, language so effectively works under water. Thus, snakes do not use language for determination of taste literally. It is used by them as addition to body for definition of a smell.