Large herd of european bisons in the wild in the cold winter forest of Bialowieca National park in Poland covered of snow

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