These crawling animals have a well-developed nervous system and an intermediate intelligence that could be placed between that of fish and that of mammals. Although most of them do not see, their sense of smell is very keen and they rely heavily on him to hunt. But, in addition, they are endowed with an additional chemical element that they use almost always. They stick out their tongue and with it collect the smells that they transport to the palate. There they are put in contact with a receptor called the " Jacobson's organ " or vomeronasal, which is located between the eye and the ear, on both sides of the head, and consists of two very sensitive hollow structures. Through fine ducts, the vomeronasal organ captures the molecules and chemical sensations collected by the tongue on the outside and carries them to internal cells. They process the information and send it to the brain.>
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