The Lower Oder Valley is especially known for its birds. 160 species of breeding birds have been counted on the German side of the International Park alone, and 50 mammal, 6 reptile, 11 amphibious and 49 fish species in addition to that. Besides the black stork and the Eurasian eagle-owl, there are three eagle species - the sea eagle, the osprey, and the lesser spotted eagle - that breed in the Lower Oder Valley. Other notable birds are the black tern, the whiskered tern and the white-winged tern, all of which regularly breed here, but also the corn crake population and Germany's last aquatic warbler breeding pairs. Significant among the mammals are the Eurasian river otter and the thriving population of beavers.