The site contains the main mountain massif of the Italian Julian Alps, where many habitats are present, both in the mountains and in the sub-Alps. There are numerous ecologically and phytosociologically relevant habitats and there is therefore a high concentration of rare species. On the site, there are abundant populations of Campanula zoysii and Cypripedium calceolus. This is also an alpine area of national ornithological importance, due to its extension in relation to the specific richness of the typical biocenosis. The area stands out for populations of Horvath’s rock lizard (Iberolacerta horvathi), black salamander (Salamandra atra), Hyla arborea, yellow-bellied toad (Bombina variegata), Italian crested newt (Triturus carnifex) and Triturus v. vulgaris. Rather common is Martes martes, while Brown Bear and European lynx rarely appear. The Wildcat has also been reported recently. Alpine ibex (Capra ibex) and groundhog (Marmota marmota) have been reintroduced by humans and are fairly common. On the site of the Val Dogna, River crayfish (Austropotamobius pallipes) is present while, in the perennial running waters, there is the European bullhead. Even Erebia calcaria and Helix pomatia deserve special attention.