Hunting is considered one of the main causes of voluntary introduction of mammals and birds. Indeed, in Europe, a quarter of the introductions of new species of birds and one-fifth of new species of mammals are due to hunting. The introduction in Italy of many species including alien species such as the Eastern Cottontail and the Eastern Coturnice is always due to hunting. Even though in the last decades the amount of the new species introduced for hunting reasons is decreasing, the restocking with small exotic game such as pheasants, hares, wild rabbits and partridges, still remains a very used practice.