In the Park, 193 species of birds have been registered, 54 among them are very rare (Black stork (Ciconia nigra), Buzzard (Buteo, buteo), Red-necked Grebe (Podiceps grisegena), Gray-headed Woodpecker (Picus canus) and others. 13 species of mammals of total number 49 have been listed by the Red List of Lithuania (lynx, otter, white rabbit and others). Even 11 species of bats live on the territory of the Park (overall number in Lithuania 15 species). Most frequently Brown long-eared bats (Plecotus auritus) and Nathusius‘ pipistrele bats (Pipistrellus nathusii) are met. In the waters of the Park, 31 species of fishes are breeding, also some whitefishes live here – vedace and lake whitefish that have been living here since post-glacial period. The wide-claw crayfish also live in abundant lakes and streams. 2129 species of invertebrates are known, among them 620 species of insects and 660 species of butterflies.