Fauna
Valley of Biebrza on the Europan scale is an enclave for water-mud birds. There was observed 278 species of birds, 178 of them legowe. From 56 species wchich in Poland are know as a dangerous and nearly dead 17 ot them live in park, example: debult, wodniczka, rybitwa czarna, rybitwa małoskrzydła, orlik grubodzioby. For the few of them muds of Biebrza are one of the last hope guaranting live for their population in Central Europe. For many groups of fauna evidence aren't complete and need correction. On the area of Park lives 48 species of Mammals, including 10 species of bats and rare in Poland, 12 species of Reptiles, 5 of Amphibia and 37 pieces of fish. Fauna of Invertebrates is weak known. For these day there are registered 788 species of butterflys, 699 species of Beetles, 450 spieces of spiders and 339 spieces of invetebrates from other ordination groups.
