The most precious habitats within project area under protection of Natura 2000 and project activities are:
- alkaline fens – the biggest areas of these peatlands can still be found by the Biebrza River in the upper valley. They are home to many rare species of orchids, e.g. Marsh Helleborine, Anacamptis palustris or Liparis loeselii and birds, e.g. the Aquatic Warbler, the Corn Crake, the Montagu’s Harrier or the Black Grouse;
- transitional mires and bogs – these are important habitats for common cottongrass, alpine bulrush or Drepanocladus vernicosus, and nesting grounds for the Crane or the Little Crake;
- molinia meadows – these are the most precious semi-natural plant communities in Poland. They are important also for birds. They have been developed, among others, thanks to traditional farming;
- bog woodlands – these are valuable refugia for numerous raptors, e.g. the Greater Spotted Eagle or woodpackers such as the rare White-backed Woodpecker. We will also find here a very common bog cranberry.