European Bison behind a fence, endangered species in captivity for introduction into the wild

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