"Scots Pines (Pinus sylvestris) in a dense pine forest, Biebrza National Park, Poland, Europe"

"Scots Pines (Pinus sylvestris) in a dense pine forest, Biebrza National Park, Poland, Europe"

"Penduline Tit (Remiz pendulinus) flying from its nest, Biebrza National Park, Poland, Europe"

"Black Woodpecker (Dryocopus martius) feeding chicks at the nest hole, Biebrza National Park, Poland, Europe"

"Black Woodpecker (Dryocopus martius) feeding chicks at the nest hole, Biebrza National Park, Poland, Europe"

"Black Woodpecker (Dryocopus martius), young bird looking out of the nest hole, Biebrza National Park, Poland, Europe"

"Two Black Woodpeckers (Dryocopus martius), young birds, looking out of the nest hole, Biebrza National Park, Poland, Europe"

"Forest of Downy Birch or White Birch (Betula pubescens) in a light mist, Biebrza National Park, Poland, Europe"

"Young Oak tree (Quercus), growing in between Scots Pines (Pinus sylvestris) in a pine forest, Biebrza National Park, Poland, Europe"

"Young Oak tree (Quercus), growing in between Scots Pines (Pinus sylvestris) in a pine forest, Biebrza National Park, Poland, Europe"

"Young Oak tree (Quercus), growing in between Scots Pines (Pinus sylvestris) in a pine forest, with Lily of the Valley flowers (Convallaria majalis) at the front, Biebrza National Park, Poland, Europe"

"Bialowieski Park Narodowy"""", entrance sign in snow, Bialowieza Special Protected Area, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe"

"Path for visitors across the shifting sand dunes, Slowinski National Park, Pomeranian Voivodeship, Poland, Europe"

"Shifting sand dunes slowly but inexorably swallowing up adjacent trees, Slowinski National Park, Pomeranian Voivodeship, Poland, Europe"

"Shifting sand dunes slowly but inexorably swallowing up adjacent trees, Slowinski National Park, Pomeranian Voivodeship, Poland, Europe"

"Shifting sand dunes slowly but inexorably swallowing up adjacent trees, Slowinski National Park, Pomeranian Voivodeship, Poland, Europe"

White Stork (Ciconia ciconia), Biebrza National Park, Poland, Europe

"Sunrise, Biebrza National Park, Podlaskie Voivodeship, Poland, Europe"