The site in its limited extension preserves, together with other sites of the Friuli Natura 2000 network, what remains after the reclamation and intensive agriculture of the ancient resurgence marshes. In the marsh of Porpetto there are peat bog habitats that present numerous rare species such as orchid species, Senecio fontanicola, Gladiolus palustris, Sesleria uliginosa etc. The marsh area is bordered by the highway but impenetrable, due to the presence of shrub willows. The Porpetto peat bog proves to be one of the last reproductive sites at regional level for Montagu’s harrier (Circus pygargus), while it plays an important role in terms of ecological connection for less-moving species such as Italian agile frog (Rana latastei) and Italian crested newt (Triturus carnifex), amphibians included in Annex II of the Habitat Directive. Among the bird species, the presence in the reproductive period of Kingfisher (Alcedo atthis), Little bittern (Ixobrychus minutus) and Red-backed shrike (Lanius collurio) should be noted. In winter and during migratory movements, Hen harrier (Circus cyaneus) and Western marsh harrier (Circus aeruginosus) are observed with some regularity.