Peter Schwarz/ BIA / Dryad (Minois dryas) butterfly, Poland

Bruno de Faveri / White-tailed Eagle (Haliaeetus albicilla) pair fighting, Poland

Piotr Naskrecki / Dor Beetle (Geotrupes vernalis), Poland

Piotr Naskrecki / Tadpole Shrimp (Triops cancriformis) with exuvia, Poland

Piotr Naskrecki / Grass Snake (Natrix natrix), Poland

Piotr Naskrecki / Tadpole Shrimp (Triops cancriformis), Poland

Piotr Naskrecki / Tadpole Shrimp (Triops cancriformis), Poland

Jochen Gerlach/ BIA / White-tailed Eagle (Haliaeetus albicilla) in aggressive display, Lodz, Poland

Hans Glader/ BIA / Lesser Spotted Eagle (Aquila pomarina), Poland

Mathias Schaef/ BIA / Ring-necked Pheasant (Phasianus colchicus) male at waterhole, Lodz, Poland

Ralph Martin/ BIA / Meadow Pipit (Anthus pratensis), Poland

Hans Glader/ BIA / Lesser Spotted Eagle (Aquila pomarina), Poland

Thomas Hinsche/ BIA / White-tailed Eagle (Haliaeetus albicilla) landing on ice, Poland

Winfried Wisniewski / White Stork (Ciconia ciconia) feeding on worm, Biebrza National Park, Poland

Oliver Richter / White-tailed Eagle (Haliaeetus albicilla) pair fighting, Poland

Oliver Richter / White-tailed Eagle (Haliaeetus albicilla), Poland

Oscar Diez / White-tailed Eagle (Haliaeetus albicilla), Kutno, Poland

Walter Soestbergen / Black Redstart (Phoenicurus ochruros), Poland

Walter Soestbergen / White Stork (Ciconia ciconia) pair at nest, Poland

Walter Soestbergen / Black Redstart (Phoenicurus ochruros) male, Poland

Winfried Wisniewski / Eurasian Penduline-Tit (Remiz pendulinus) male on reed blade, Biebrza National Park, Poland

Winfried Wisniewski / Eurasian Penduline-Tit (Remiz pendulinus) male looking out of nest, Biebrza National Park, Poland

Winfried Wisniewski / Ruff (Philomachus pugnax) male molting into breeding plumage, Biebrza National Park, Poland

Winfried Wisniewski / Ruff (Philomachus pugnax) flock migrating, Biebrza National Park, Poland

Winfried Wisniewski / Gray Wolf (Canis lupus) pair fighting showing dominance and submission, Poland

Winfried Wisniewski / Gray Wolf (Canis lupus) laying in snow, Poland

Winfried Wisniewski / Gray Wolf (Canis lupus) trio showing dominance and aggression, Poland

Winfried Wisniewski / Gray Wolf (Canis lupus) pack in snow re-establishing social structure, Poland

Jasper Doest / Western Roe Deer (Capreolus capreolus) male standing on farmland, Poland

Jasper Doest / Grass Snake (Natrix natrix) flicking tongue, Poland

Piotr Naskrecki / Edible Snail (Helix pomatia), Poland

Piotr Naskrecki / Green Rose Chafer (Cetonia aurata), Poland

Piotr Naskrecki / Great Green Bush Cricket (Tettigonia viridissima), Poland

Piotr Naskrecki / Meadow Grasshopper (Chorthippus parallelus), Poland

Piotr Naskrecki / Tadpole Shrimp (Triops cancriformis), Poland

Piotr Naskrecki / Grasshopper (Chorthippus apricarius), Poland

Piotr Naskrecki / Stripe-winged Grasshopper (Stenobothrus lineatus), Poland

Oscar Diez/ BIA / Middle Spotted Woodpecker (Dendrocopos medius), Bialowieza Forest, Poland

Oscar Diez/ BIA / Common Buzzard (Buteo buteo) feeding in winter, Bialowieza Forest, Poland

Mathias Schaef/ BIA / Ring-necked Pheasant (Phasianus colchicus) male wading, Lodz, Poland

Ralph Martin/ BIA / Whinchat (Saxicola rubetra) male, Poland

Hans Glader/ BIA / Osprey (Pandion haliaetus) fishing, Poland

Hans Glader/ BIA / Western Marsh-Harrier (Circus aeruginosus) male, Poland

Roland Seitre / Western Roe Deer (Capreolus capreolus) buck with abnormal antlers, Poland

Winfried Wisniewski / Whooper Swan (Cygnus cygnus) pair fighting, Poland

Winfried Wisniewski / Whooper Swan (Cygnus cygnus) pair courting, Poland

Winfried Wisniewski / Whooper Swan (Cygnus cygnus) with neck band, Poland