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

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

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

Marsh marigolds (kingcups) (Caltha palustris) flowering on flooded Narew sedge marshes, Krzewo, Podlaskie, Poland, Europe

Black alder (Alnus glutinosa) carr swamp forest edge in early spring, Biebrza National Park, Podlaskie, Poland.

White willow (Salix alba) tree with base of trunk almost chewed through by Eurasian beaver (Castor fiber), Narew marshes, Podlaskie, Poland. MORE INFO: Beaver activity is crucial in keeping Poland's ancient marshes open and free of encroaching bushes and trees and their dams also help to maintain high water levels.

White stork (Ciconia ciconia) adult collecting nest material on Narew marshes in spring, Podlaskie, Poland.

Eurasian beaver (Castor fiber) dam on drainage channel in Narew marshes, Podlaskie, Poland. MORE INFO: Beaver activity benefits much other wetland wildlife by helping to maintain high water levels in Poland's ancient marshes and swamp forests.

Farmer ploughing at edge of Narew marsh among carpet of Dandelions (Taraxacum sp.) in spring, Podlaskie, Poland.

Poland, Podlaskie, Bialostok Fountain on illuminated town square, Poland