A complex of raised bogs, marshes, forests, meadows and a large, shallow, overgrown, nutrient-rich lake.
An important wetland for a wide variety of breeding and migrating waterbirds (including good numbers of Anser fabalis and A. albifrons on passage). Acrocephalus paludicola has greatly decreased since 1980, when there were 25-30 pairs. This is the best breeding site for Porzana parva and P. porzana in Lithuania. Breeding species of global conservation concern that do not meet IBA criteria: Crex crex (3-5 calling males), Gallinago media. More than 10 pairs of Aythya nyroca bred in the 1970s but no recent data are available.
BirdLife International (2020) Important Bird Areas factsheet: Zuvintas Biosphere Reserve. Downloaded from http://www.birdlife.org on 28/03/2020.