Kampinos National Park is one of the most important wildlife refuges Polish lowlands. It is estimated that there may be a half, or approx. 16.5 thousand species of native animals. So far documented existence of over 3 thousand. species, which indicates a relatively low degree of examination of the fauna of the area. The most numerous group of animals are the invertebrates (including 31 species of mosquitoes). Kampinoska Forest is a place of occurrence of each of the 13 lowland species of amphibians and 6 species of reptiles. In the park and the buffer zone nests over 150 species of birds, among them a dozen pairs of black storks and cranes (some nest just a few kilometers from the borders of the capital), lesser spotted eagle, and since 2000 year- white-tailed eagle. In open areas frequently occurs corncrake, a species threatened with extinction on a global scale. Including the period of pozalęgowym observed 215 species of birds here. Place a large number of wintering water birds is the nearby Vistula. The occurrence of parkland for many rare and endangered birds, especially Grasshopper and the corncrake, decided to recognize in 1999 by the European Parliament this area as a bird refuge of European importance. Since 2004. Kampinoski National Park is also a Natura 2000 area (PLC code 140001), both because of the richness of species of birds (Birds Directive) and the diversity of plant communities (Habitats Directive).
The National Park contains 66 species of trees and 70 species of shrubs, of which 33 species of trees and 46 species of shrubs is the origin of the home. The main species are pine lasotwórczym, occupying 69.5% of the forest area, next are alder, black (12.5%) and holm oak (10.30%) and silver birch and downy (6.45%). Forests cover over 73% of the park, the rest being various types of non-forest communities. Dune areas are almost entirely covered by forests, dominated by pine forests and mixed fresh. Small fragments of dunes covered by thermophilic communities glaucae and grasslands. On the fertile soils on the slopes and podnóżach mineral sand dunes and islands of the swamp growing broadleaved - multispecies deciduous forests consisting of oaks, hornbeam, linden clones. Forest communities are alder wetlands where the constituent trees (alder with a touch of birch) grow in clumps, between which a large part of the year is water. The banks of watercourses are covered with alder-ash riparian forests. The natural communities of open wetlands are sedges, which are currently in the larger fragments are preserved in the southern part of the park. In the past, many wetlands have been deforested, drained and transformed into meadows and pastures.