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