Hans Glader/ BIA / Griffon Vulture (Gyps fulvus) group, Spain

Hans Glader/ BIA / White-fronted Goose (Anser albifrons) group flying, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Blood moon, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Eurasian Oystercatcher (Haematopus ostralegus) pair mating, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Sand Martin (Riparia riparia) pair at nest cavity, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Sand Martin (Riparia riparia) at nest cavity, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Great Crested Grebe (Podiceps cristatus) on nest, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Kentish Plover (Charadrius alexandrinus) male, Lesvos, Greece

Hans Glader/ BIA / Collared Pratincole (Glareola pratincola), Lesvos, Greece

Hans Glader/ BIA / Collared Pratincole (Glareola pratincola), Lesvos, Greece

Hans Glader/ BIA / Kentish Plover (Charadrius alexandrinus) male, Lesvos, Greece

Hans Glader/ BIA / Little Crake (Porzana parva) male foraging, Lesvos, Greece

Hans Glader/ BIA / Glossy Ibis (Plegadis falcinellus) flying, Lesvos, Greece

Hans Glader/ BIA / Marsh Sandpiper (Tringa stagnatilis) wading, Lesvos, Greece

Hans Glader/ BIA / White-spotted Bluethroat (Luscinia svecica cyanecula) male calling, Netherlands

Hans Glader/ BIA / Sardinian Warbler (Sylvia melanocephala) male, Mallorca, Spain

Hans Glader/ BIA / Sardinian Warbler (Sylvia melanocephala) male calling, Mallorca, Spain

Hans Glader/ BIA / European Robin (Erithacus rubecula) calling, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Parrot Crossbill (Loxia pytyopsittacus) male, Netherlands

Hans Glader/ BIA / Hoary Redpoll (Carduelis hornemanni) trio, Netherlands

Hans Glader/ BIA / Hoary Redpoll (Carduelis hornemanni), Netherlands

Hans Glader/ BIA / White-fronted Goose (Anser albifrons) group flying in blowing snow, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Lapwing (Vanellus vanellus) flock flying, North Rhine-Westphalia, Germany

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

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

Hans Glader/ BIA / Sand Martin (Riparia riparia) at nest cavity, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Black Woodpecker (Dryocopus martius) mother at nest cavity with chick, North Rhine-Westphalia, Germany

Hans Glader/ BIA / European Flamingo (Phoenicopterus roseus) group flying, Greece

Hans Glader/ BIA / White-spotted Bluethroat (Luscinia svecica cyanecula) male calling from cattail, Netherlands

Hans Glader/ BIA / White-spotted Bluethroat (Luscinia svecica cyanecula) male calling, Netherlands

Hans Glader/ BIA / Brant (Branta bernicla) group flying, Netherlands

Hans Glader/ BIA / Black Stork (Ciconia nigra), Greece

Hans Glader/ BIA / Great Bittern (Botaurus stellaris) foraging, Austria

Hans Glader/ BIA / Great Gray Owl (Strix nebulosa) flying over snow, Finland

Hans Glader/ BIA / Great Gray Owl (Strix nebulosa) flying over snow, Finland

Hans Glader/ BIA / Northern Gannet (Morus bassanus) flying with fishing line entangled around bill, Schleswig-Holstein, Germany

Hans Glader/ BIA / Black Stork (Ciconia nigra) wading, Greece

Hans Glader/ BIA / White-fronted Goose (Anser albifrons) flock flying, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Griffon Vulture (Gyps fulvus), Spain

Hans Glader/ BIA / Eurasian Wigeon (Anas penelope) flock flying, Netherlands

Hans Glader/ BIA / Eurasian Wigeon (Anas penelope) flock flying, Netherlands

Hans Glader/ BIA / Mixed conifer and deciduous forest in fall, Austria

Hans Glader/ BIA / Egyptian Goose (Alopochen aegyptiacus), North Rhine-Westphalia, Germany

Hans Glader/ BIA / Egyptian Goose (Alopochen aegyptiacus) flying, North Rhine-Westphalia, Germany

Hans Glader/ BIA / Whooper Swan (Cygnus cygnus) group in lake in winter, Finland

Hans Glader/ BIA / Whooper Swan (Cygnus cygnus) group in lake in winter, Finland

Hans Glader/ BIA / Whooper Swan (Cygnus cygnus) group in lake in winter, Finland

Hans Glader/ BIA / Little Ringed Plover (Charadrius dubius) female at nest with eggs, North Rhine-Westphalia, Germany