The Narew National Park and its buffer zones are a core bird life area of European importance. About 203 species of birds live in the various ecosystems. Moreover, the Narew valley is an important stop over for many migrating birds and provides excellent resting sites, particularly during spring time. Several of these species are threatened, including bittern, Montagu's harrier, great snipe, curlew, spotted crake, little crake, and aquatic warbler. The emblem of the National Park is the marsh harrier. Due to the unique diversity of the flora and fauna in the Narew National Park this area is an important site regarding the European Network of Natura 2000.
The Narew National Park is inhabited by 40 species of mammals, of witch the most characteristic ones - beaver and other are connected with water or marshy areas. The visitors can also meet elk, roe deer, wild boar, musk-rat, fox, raccoon dog, weasel, ermine, American mink, stone marten and others.
