Young European Bison Bonasus porthrait covered in snow with white background in Bialowieza forest, Poland

european bison bison bonasus bison buffalo wisent artiodactyla bull mammal bovidae fur wildlife rewilding horn horns animal bialowieza national park snow head grazing ruminant bialowieza hervivore closeup male endangered bonasus cold largest winter national park brown wild zubr extinct large protected reintroduction biaowieza nature danger close storm poland polish symbol grass european outdoor forest park