There is a lot of dead wood, and that means many insects, so many birds, small and large, including the green and black woodpecker thrive.
Cranes, whooper swans, Eurasian curlews and wood sandpipers are characteristic birds along with somewhat more unusual species such as the jack snipe and the whimbrel. Black grouse and capercaillie also do well here. There are resident golden eagles, and white-tailed eagles appear regularly year-round. Ospreys hunt at Kävsjön lake. Especially in winter there are lots of eagles because the birds of prey are fed in the national park from November until March.
You can come across elk, roe deer, fox and badger here and there. Otter are in the area. About 25 different species of dragonflies flit around during the summer.
There is a plentiful supply of fish in Kävsjön and Kalvasjön lakes, but pools in the moss are devoid of fish because of the low pH value.