Biogenetic reserves act as 'living laboratories' and are representative examples of various types of natural environment in Europe. They can consist of natural or semi-natural habitats and their selection is based on their value for nature conservation and protected status based on four criteria: 'typical', 'unique', 'rare' and/or 'endangered' which can be applied to habitats or species. The protected status must be adequate to ensure the conservation or management of the sites in the long term in accordance with fixed objectives.