The site is a complex mix of bogs, forests, floodplain meadows, lakes and agricultural land. The site is characterized by high diversity and contrasting ecological conditions, as well as the presence of unique nature complexes: large tracts of bogs and transition mires, open fens, lakes, sandy dunes, almost natural forests and fragmentary oak stands.
A total of 175 breeding species of birds have been recorded. The site hosts 44 bird species listed in the National Red Data Book.
Non-bird biodiversity: The category of rare and disappearing plants listed in the National Red Data Book comprises 21 species. Many rare moss species can also be found. The fauna diversity is defined by the variety of habitats. The following Red Data Book mammal species have stable populations: Badger Meles meles (10 settlements), Lynx Felis linx (5-8) and Brown Bear Ursus arctos (3-5).
BirdLife International (2020) Important Bird Areas factsheet: Kaz'jany. Downloaded from http://www.birdlife.org on 04/04/2020.