Juergen Freund / Little red flying-foxes (Pteropus scapulatus) in flight, Wild River, Heberton, Australia.

Juergen Freund / Little red flying-fox (Pteropus scapulatus) in flight, Wild River, Heberton, Australia.

Thomas Lazar / Common loon (Gavia immer) 'Wing Flap' display as part of preening behaviour, High Lake, Northern Highland State Forest, Wisconsin, June.

Thomas Lazar / Common loon (Gavia immer) on water stretching wings, Turtle Flambeau Scenic Waters Area, Wisconsin, June.

Roland Seitre / Spanish Imperial Eagle (Aquila adalberti) chick stretching wings at nest, near Jaen, Andujar, Sierra Morena, Spain.

Roland Seitre / Spanish Imperial Eagle (Aquila adalberti) chick stretching wings at nest, near Jaen, Andujar, Sierra Morena, Spain.

Roland Seitre / Andean condors (Vultur gryphus) perched on rock, with one flapping wings, with mountainous habitat in the background, Chivay, Arequipa , Peru.

Roland Seitre / Andean condor (Vultur gryphus) in flight, Chivay, Arequipa , Peru.

Roland Seitre / Andean condor (Vultur gryphus) in flight, Chivay, Arequipa , Peru.

Joel Sartore / Photo Ark / Carmine skimmer dragonfly (Orthemis discolor) male, portrait, Centro de Rescate Amazonico, Peru. Captive.

Joel Sartore / Photo Ark / Geometer moth (Bryoptera friaria) portrait, from the wild, Tapir Valley, Costa Rica.

Joel Sartore / Photo Ark / Geometer moth (Periclina apricaria) portrait, from the wild, San Josecito, Costa Rica.

Joel Sartore / Photo Ark / Little red flying fox (Pteropus scapulatus) hanging upside down with wings spread, Australian Bat Clinic and Narrow Leaf Retreat, Australia. Captive.

Danny Green / Tawny owl (Strix aluco) coming in to land at the edge of a small pool at night, Dumfries and Galloway, Scotland, UK. August.

Joel Sartore / Photo Ark / Dorsal view of Nepalese whiskered bat (Myotis muricola) crawling at University of the Philippines. Captivity.

Joel Sartore / Photo Ark / Dorsal view of Cave myotis bat (Myotis velifer) crawling at Austin Bat Refuge, Texas, USA. Captivity.

Joel Sartore / Photo Ark / Tricolored bat (Perimyotis subflavus) crawling and calling from private collection in Oklahoma, USA. Captivity.

Shane Gross / Two Chinstrap penguins (Pygoscelis antarcticus) calling for mate, Barrientos Island, Antarctica.

Shane Gross / Gentoo penguin (Pygoscelis papua) walking on snow, Barrientos Island, Antarctica.

Shane Gross / Pair of Gentoo penguins (Pygoscelis papua) mating, Neko Harbour, Antarctica.

Shane Gross / Chinstrap penguin (Pygoscelis antarcticus) stealing a rock for his nest, Barrientos Island, Antarctica.

Shane Gross / Chinstrap penguin (Pygoscelis antarcticus) calling for a mate, Barrientos Island, Antarctica.

Shane Gross / Gentoo penguin (Pygoscelis papua) walking across snow against a bright blue sky, Neko Harbour, Antarctica.

Shane Gross / Rockhopper penguin (Eudyptes chrysocome) portrait, Bleaker Island, Falkland Islands.

Staffan Widstrand / Pair of Eurasian bee-eaters (Merops apiaster) during courtship, Pusztaszer reserve, Hungary. May.

Staffan Widstrand / Eurasian hoopoe (Upupa epops) taking flight with a grub in its beak, Pusztaszer reserve, Hungary. May.

Staffan Widstrand / Black stork (Ciconia nigra) fishing in lake, Pusztaszer reserve, Hungary. May.

Staffan Widstrand / Grey heron (Ardea cinerea) taking flight and Black stork (Ciconia nigra) wading in shallow water, Pusztaszer reserve, Hungary. May.

Nick Upton / Male Pied avocet (Recurvirostra avosetta) perched on the back of its mate, before mating, at the edge lake, Gloucestershire, UK, May.

Nick Upton / Herring gull (Larus argentatus) landing on a grassy cliff edge, near Swanage, Dorset, UK, May.

Robert Thompson / Atlas moth (Attacus atlas) resting on a tree trunk, Thailand. Controlled conditions.

Robert Thompson / Thai oak silkmoth (Antheraea frithi) resting on a mossy branch, Thailand. Controlled Conditions.

Robert Thompson / Birch emperor moth (Rinaca lindia) resting on a tree trunk, Khyber-Pakhtunkhwa Province, Pakistan.

Robin Chittenden / Arctic skua (Stercorarius parasiticus) flying, Norfolk, UK. August.

Andy Trowbridge / Male Australian magpie (Gymnorhina tibicen) coming in to land in paddock, Canterbury, South Island, New Zealand.

Andy Trowbridge / Female New Zealand falcon (Falco novaeseelandiae) taking flight. Arthur's Pass National Park, South Island, New Zealand.

Ernie Janes / Sunbittern (Eurypyga helias) with wings spread, standing in shallow water. Captive.

Roger Powell / Grey heron (Ardea cinerea) landing on nest beside its mate, who is displaying a greeting posture of outstretched neck and head, Amble, Northumberland, UK. March.

Roger Powell / Grey heron (Ardea cinerea) landing on nest beside its mate, who is displaying a greeting posture of outstretched neck and head, Amble, Northumberland, UK. March.

Chris Mattison / Brussels lace moth (Cleorodes lichenaria) resting on lichen covered rock, Snowdonia National Park, Wales, UK.

Konrad Wothe / Great tit (Parus major) collecting nesting material, form container with wool, Bavaria, Germany, Europe. April.

Paul Harcourt Davies / Male Common scarlet-darter (Crocothemis erythraea) resting reed stem, Umbria, Italy. July.

Paul Harcourt Davies / Eastern dappled white butterfly (Euchloe ausoniae) resting on thistle, Umbria, Italy. May.

David Pattyn / Great crested grebe (Podiceps cristatus) stretching its wings, The Netherlands, Europe, March.

Bruce Thomson / Buff-necked ibis (Theristicus caudatus) with wings outstretched, Pocone, Brazil.

Bruce Thomson / Geometrinae moth (Hypodoxa sp.) camouflaged against tree branch, Toowoomba, Queensland, Australia.

Markus Varesvuo / Robin (Erithacus rubecula) carrying a red berry in its beak as it takes off, Parainen Uto, Finland. October.

Bruce Thomson / Christmas Island flying fox (Pteropus natalis) soaring over the ocean during the day, Christmas Island, Australia.

Bruce Thomson / Christmas Island flying fox (Pteropus natalis) soaring over the ocean during the day, Christmas Island, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) in flight, Cooktown, Queensland, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) in flight, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) flying out of a mine addit in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) flying out of a mine addit in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) flying out of a mine addit in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Hill's sheathtail bat (Taphozous hilli) flying out of an abandoned mine in late evening, Tennant Creek, Northern Territory, Australia

Bruce Thomson / Hill's sheathtail bat (Taphozous hilli) flying out of an abandoned mine in late evening, Tennant Creek, Northern Territory, Australia

Bruce Thomson / Hill's sheathtail bat (Taphozous hilli) flying out of an abandoned mine in late evening, Tennant Creek, Northern Territory, Australia

Bruce Thomson / Eastern horseshoe bat (Rhinolophus megaphyllus) in flight at night, Chillagoe, Queensland, Australia.

Bruce Thomson / Eastern horseshoe bat (Rhinolophus megaphyllus) in flight at night, Chillagoe, Queensland, Australia.

Bruce Thomson / Eastern horseshoe bat (Rhinolophus megaphyllus) flying out from an abandoned mine in late evening. Its orange colouring is due to bleaching from the intense ammonia atmosphere in the mine, Iron Range,...

Bruce Thomson / Large-eared horseshoe bat (Rhinolophus robertsi) flying out of cave, Cooktown, Queensland, Australia.

Doug Gimesy / Juvenile Pacific gull (Larus pacificus) flying with fish in beak, Sandringham, Victoria, Australia.

Tui De Roy / Brown pelican (Pelecanus occidentalis) diving, Santa Fe Island, Galapagos, South America.

Tui De Roy / Brown pelican (Pelecanus occidentalis) diving into sea, Santa Fe Island, Galapagos, South America.

Konrad Wothe / Northern fulmar (fulmarus glacialis) in flight, Hornstrandir Nature Reserve, Iceland. March.

Konrad Wothe / Northern fulmar (fulmarus glacialis) in flight, Hornstrandir Nature Reserve, Iceland. March.

Konrad Wothe / Northern fulmar (fulmarus glacialis) in flight, Hornstrandir Nature Reserve, Iceland. March.

Staffan Widstrand / Common tern (Sterna hirundo) catching a mayfly, Hjalstaviken, Uppland, Sweden. Nordic Nature Photo Competition 2021 Highly Commended - Nordic Bird Photo of the Year category.

David Pattyn / Great white egret (Egretta alba) landing on shallow pond on misty morning, Valkenhorst Nature Reserve, The Netherlands, September.

Mateusz Piesiak / Two Common snipe (Gallinago gallinago) foraging in mud in thick fog, Lower Silesia, Poland. Emotion'Ailes Photography Competition 2021, Category Winner - Bird in all its states.

Mateusz Piesiak / European bee-eater (Merops apiaster) two perched on branch, Lower Silesia, Poland.

Nick Upton / White stork (Ciconia ciconia) adult taking off after foraging for insects on grassland, Knepp Estate, Sussex, UK, June.

John Waters / Fulmar (Fulmarus glacialis) in flight against sky, Orkney, Scotland, UK, May.

John Waters / Fulmar (Fulmarus glacialis) in flight with open sea and clouds, Orkney, Scotland, UK, May.

John Waters / Fulmar (Fulmarus glacialis) flying, silhouetted against the sea and sky at sunset, Orkney, Scotland, UK, June.

John Waters / Looking down on Fulmar (Fulmarus glacialis) soaring above choppy sea, Orkney, Scotland, UK, May.

Mateusz Piesiak / Black-headed gull (chroicocephalus ridibundus) diving into water, hunting fish / shellfish at sunrise. Baltic Sea, Poland. Sequence 2 of 2. Winner of Rising Star Portfolio award at Wildlife Photograph...

Mateusz Piesiak / Black-headed gull (chroicocephalus ridibundus) diving into water, hunting fish / shellfish at sunrise. Baltic Sea, Poland. Sequence 1 of 2