European bison (Bison bonasus) herd walking on snow covered field in February, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

Pine (Pinus sp.) tree plantation, late afternoon sunlight in February, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

Frozen wetland area in snow covered primeval forest habitat in February, Bialowieza Strictly Protected Area, UNESCO World Heritage Site, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

European bison (Bison bonasus) bull, standing in snow covered meadow in February, with yellowhammer (Emberiza citrinella) flock in flight, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

Silver birch (Betula pendual) tree, growing on snow covered meadow in February, Bialowieza, Poland, Europe

European bison (Bison bonasus) female with calf, standing on snow covered field in February, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

European bison (Bison bonasus) bull walking in snow covered forest habitat in February, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

Spotted nutcracker (Nucifraga caryocatactes) adult, with hazelnut, Bialowieza, Poland, Europe

Silver birch (Betula pendual) tree growing on snow covered meadow in February, Bialowieza, Poland, Europe

European bison (Bison bonasus) bull with radio tracking collar, standing in snow covered forest habitat in February, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

European bison (Bison bonasus) herd walking on snow covered field in February, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

Wild European bison (Bison bonasus) walking in a meadow in winter, Bialowieza National Park, Poland, Europe

Wild European bison (Bison bonasus) walking in a meadow in winter, Bialowieza National Park, Poland, Europe

Hawk (Accipiter gentilis), branch, Bialowieza, Poland, Europe

Middle-spotted woodpecker (Dendrocoptes medius), Great Tit (Parus major), tree, Bialowieza, Poland, Europe

A buzzard (Buteo buteo), branch, Bialowieza, Poland, Europe

Hawk (Accipiter gentilis), branch, Bialowieza, Poland, Europe

Middle-spotted woodpecker (Dendrocoptes medius), tree, Bialowieza, Poland, Europe

Northern goshawk (Accipiter gentilis) on a stump in hiver, Bialowieza, Poland

Northern goshawk (Accipiter gentilis) on a stump in hiver, Bialowieza, Poland