Snakes (Serpentes) belong to the class of reptiles (Reptilia), subclass Lepidosauria, order Squamata (Squamata). Suborder Serpentes includes 2500 species (of which about 70% are family Colubridae). Are grouped into 17 families. Snakes inhabit a wide range of habitats, from deserts and tropical forests all the way to the cold polar tundra zone. Are widespread on all continents (except Antarctica) and not many oceanic islands. but it has the most tropical and subtropical regions. In Croatia there are 16 species of snakes. All 16 species of snakes in the Republic of Croatia shall be protected by the Nature Protection Act (N.N.70/05) and the Ordinance on the proclamation of wild species of protected and strictly protected (NN 07/06), and are not intentionally killing or harming behavior. It is also prohibited and their harassment, capture and confinement. Snakes in the ecosystem have a very important role in controlling the population size of small mammals (mice, voles, shrews, etc.) and insects. Overly large populations of small mammals, not only causing destruction of natural resources (crops) but also act as a base for spreading many diseases, some of which are for people, even deadly.