Mathias Schaef/ BIA / Eurasian Bullfinch (Pyrrhula pyrrhula) male, Finnmark, Norway

Mathias Schaef/ BIA / White-tailed Eagle (Haliaeetus albicilla) juveniles fighting, Lodz, Poland

Mathias Schaef/ BIA / White-tailed Eagle (Haliaeetus albicilla) juvenile wading, Lodz, Poland

Mathias Schaef/ BIA / White-tailed Eagle (Haliaeetus albicilla) juvenile in aggressive display, Lodz, Poland

Mathias Schaef/ BIA / White-tailed Eagle (Haliaeetus albicilla) juveniles fighting, Lodz, Poland

Mathias Schaef/ BIA / Pin-tailed Sandgrouse (Pterocles alchata) male, Israel

Mathias Schaef/ BIA / Blackstart (Cercomela melanura) in desert, Israel

Mathias Schaef/ BIA / Nubian Ibex (Capra nubiana) male in desert mountains, Gan HaDarom, Israel

Mathias Schaef/ BIA / Nubian Ibex (Capra nubiana) male in desert mountains, Gan HaDarom, Israel

Mathias Schaef/ BIA / Spur-winged Plover (Vanellus spinosus), Israel

Mathias Schaef/ BIA / European Goldfinch (Carduelis carduelis), Lesvos, Greece

Mathias Schaef/ BIA / Mallard (Anas platyrhynchos) male flapping, Baden-Wurttemberg, Germany

Mathias Schaef/ BIA / Common House Martin (Delichon urbicum) at pond, Pleven, Bulgaria

Mathias Schaef/ BIA / Short-eared Owl (Asio flammeus) foraging, Burgenland, Austria

Mathias Schaef/ BIA / Ruff (Philomachus pugnax) male displaying at lek, Finnmark, Norway

Mathias Schaef/ BIA / Ruff (Philomachus pugnax) male displaying at lek, Finnmark, Norway

Mathias Schaef/ BIA / Eastern Orphean Warbler (Sylvia crassirostris) male calling, Lesvos, Greece

Mathias Schaef/ BIA / Mourning Wheatear (Oenanthe lugens) male, Israel

Mathias Schaef/ BIA / Mourning Wheatear (Oenanthe lugens) juvenile spreading wings, Israel

Mathias Schaef/ BIA / Corn Bunting (Emberiza calandra), Gan HaDarom, Israel

Mathias Schaef/ BIA / Corn Bunting (Emberiza calandra) at waterhole, Gan HaDarom, Israel

Mathias Schaef/ BIA / Griffon Vulture (Gyps fulvus), Extremadura, Spain

Mathias Schaef/ BIA / Common Murre (Uria aalge), Finnmark, Norway

Mathias Schaef/ BIA / Common Murre (Uria aalge) flying, Finnmark, Norway

Mathias Schaef/ BIA / Spanish Sparrow (Passer hispaniolensis) male at waterhole, Israel

Mathias Schaef/ BIA / Spanish Sparrow (Passer hispaniolensis) female at waterhole, Israel

Mathias Schaef/ BIA / European Turtle-Dove (Streptopelia turtur) at waterhole, Israel

Mathias Schaef/ BIA / Tristram's Starling (Onychognathus tristramii) male, Israel

Mathias Schaef/ BIA / Water Rail (Rallus aquaticus), Rhineland-Palatinate, Germany

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

Mathias Schaef/ BIA / Red-throated Pipit (Anthus cervinus), Finnmark, Norway

Mathias Schaef/ BIA / Common Raven (Corvus corax) chicks in nest, Finnmark, Norway

Mathias Schaef/ BIA / Ruff (Philomachus pugnax) male displaying at lek, Finnmark, Norway

Mathias Schaef/ BIA / Red-throated Pipit (Anthus cervinus) at waterhole, Israel

Mathias Schaef/ BIA / Collared Pratincole (Glareola pratincola), Israel

Mathias Schaef/ BIA / Collared Pratincole (Glareola pratincola) flying, Israel

Mathias Schaef/ BIA / Ortolan Bunting (Emberiza hortulana) male, Israel

Mathias Schaef/ BIA / Ortolan Bunting (Emberiza hortulana) male, Israel

Mathias Schaef/ BIA / Masked Shrike (Lanius nubicus) male, Israel

Mathias Schaef/ BIA / Rueppell's Warbler (Sylvia rueppelli) male, Israel

Mathias Schaef/ BIA / Hooded Wheatear (Oenanthe monacha) male, Israel

Mathias Schaef/ BIA / Pied Kingfisher (Ceryle rudis), Israel

Mathias Schaef/ BIA / Common Myna (Acridotheres tristis) pair courting, Israel

Mathias Schaef/ BIA / Crowned Sandgrouse (Pterocles coronatus) group at waterhole in desert, Gan HaDarom, Israel

Mathias Schaef/ BIA / Crowned Sandgrouse (Pterocles coronatus) male, Gan HaDarom, Israel

Mathias Schaef/ BIA / Crowned Sandgrouse (Pterocles coronatus) female drinking at waterhole, Gan HaDarom, Israel

Mathias Schaef/ BIA / Crowned Sandgrouse (Pterocles coronatus) male, Gan HaDarom, Israel

Mathias Schaef/ BIA / Masked Dove (Oena capensis) juvenile at waterhole, Gan HaDarom, Israel

Mathias Schaef/ BIA / Arabian Babbler (Turdoides squamiceps), Gan HaDarom, Israel

Mathias Schaef/ BIA / Woodchat Shrike (Lanius senator) male, Lesvos, Greece

Mathias Schaef/ BIA / Red-rumped Swallow (Cecropis daurica), Lesvos, Greece

Mathias Schaef/ BIA / Red-rumped Swallow (Cecropis daurica), Lesvos, Greece

Mathias Schaef/ BIA / Red-rumped Swallow (Cecropis daurica) flying, Lesvos, Greece

Mathias Schaef/ BIA / Barn Swallow (Hirundo rustica) flying, Lesvos, Greece

Mathias Schaef/ BIA / Isabelline Wheatear (Oenanthe isabellina), Lesvos, Greece

Mathias Schaef/ BIA / Common Raven (Corvus corax), Extremadura, Spain

Mathias Schaef/ BIA / Common Wood-pigeon (Columba palumbus), Rhineland-Palatinate, Germany

Mathias Schaef/ BIA / Purple Heron (Ardea purpurea) flying, Baden-Wurttemberg, Germany

Mathias Schaef/ BIA / Rose-ringed Parakeet (Psittacula krameri) chick in nest cavity, Baden-Wurttemberg, Germany

Mathias Schaef/ BIA / Rose-ringed Parakeet (Psittacula krameri) male at nest cavity, Baden-Wurttemberg, Germany

Mathias Schaef/ BIA / Black-legged Kittiwake (Rissa tridactyla) pair squabbling while flying, Finnmark, Norway

Mathias Schaef/ BIA / Chukar (Alectoris chukar), Israel

Mathias Schaef/ BIA / Coot (Fulica atra) at nest, Burgenland, Austria

Mathias Schaef/ BIA / Long-tailed Jaeger (Stercorarius longicaudus) flying, Finnmark, Norway

Mathias Schaef/ BIA / White-throated Kingfisher (Halcyon smyrnensis), Israel

Mathias Schaef/ BIA / Great Reed-Warbler (Acrocephalus arundinaceus) male calling, Vienna, Austria

Mathias Schaef/ BIA / Great Reed-Warbler (Acrocephalus arundinaceus) male calling, Vienna, Austria

Mathias Schaef/ BIA / Brambling (Fringilla montifringilla) male, Finnmark, Norway

Mathias Schaef/ BIA / Pale Rosefinch (Carpodacus synoicus) male, Israel

Mathias Schaef/ BIA / Yellow-billed Chough (Pyrrhocorax graculus) flock, Valais, Switzerland

Mathias Schaef/ BIA / Cretzschmar's Bunting (Emberiza caesia) female, Greece

Mathias Schaef/ BIA / Bearded Vulture (Gypaetus barbatus) flying, Valais, Switzerland

Mathias Schaef/ BIA / Bearded Vulture (Gypaetus barbatus) flying, Valais, Switzerland

Mathias Schaef/ BIA / Yellow-billed Chough (Pyrrhocorax graculus) flying, Valais, Switzerland

Mathias Schaef/ BIA / Red-rumped Swallow (Cecropis daurica), Gaziantep, Turkey

Mathias Schaef/ BIA / Red-rumped Wheatear (Oenanthe moesta) female displaying, Morocco

Mathias Schaef / Common Ground Dove (Columbina passerina), Florida

Mathias Schaef / White Ibis (Eudocimus albus) with crab prey, Florida

Mathias Schaef / Red-backed Shrike (Lanius collurio) female, Bulgaria

Mathias Schaef / Black-bellied Plover (Pluvialis squatarola) pair flying, Florida

Mathias Schaef / Rose-ringed Parakeet (Psittacula krameri) female in nest cavity, Germany

Mathias Schaef / Peregrine Falcon (Falco peregrinus) hunting, Rhineland-Palatinate, Germany

Mathias Schaef / Imperial Eagle (Aquila heliaca) flying, Oman

Mathias Schaef / Familiar Chat (Cercomela familiaris), Kgalagadi Transfrontier Park, South Africa

Mathias Schaef / Familiar Chat (Cercomela familiaris), Hardap, Namibia

Mathias Schaef / Pied Crow (Corvus albus), Namib-Naukluft National Park, Namibia

Mathias Schaef / Rock Sparrow (Petronia petronia), Lesvos, Greece

Mathias Schaef / Red-shouldered Glossy-Starling (Lamprotornis nitens) male, Kruger National Park, South Africa

Mathias Schaef / Stock Dove (Columba oenas), Rhineland-Palatinate, Germany

Mathias Schaef / Eastern Olivaceous Warbler (Iduna pallida), Birecik, Sanliurfa, Turkey

Mathias Schaef / European Turtle-Dove (Streptopelia turtur), Rhineland-Palatinate, Germany

Mathias Schaef / Eastern Olivaceous Warbler (Iduna pallida), Birecik, Sanliurfa, Turkey

Mathias Schaef / European Partridge (Perdix perdix) pair in agricultural field, Rhineland-Palatinate, Germany

Mathias Schaef / European Partridge (Perdix perdix), Rhineland-Palatinate, Germany

Mathias Schaef / Western Marsh-Harrier (Circus aeruginosus) flying past a flock of birds, Rhineland-Palatinate, Germany

Mathias Schaef / Western Marsh-Harrier (Circus aeruginosus) flying, Germany