Endemism is a term used in biology to indicate that the distribution of a taxon is restricted to a geographical area reduced, not found naturally in any other part of the world. Therefore, when it indicates that a species is endemic to certain region, means that it is only possible to find in a natural way in this place.Endemism can be seen in a very wide range of geographic scales: thus, an organism may be endemic to a mountain top or a Lake, a mountain or a river system, an island, a country or even a continent. Usually the concept is applied to species, but it can also be used for other taxa as subspecies, varieties, genera, families, etc.