Pal Hermansen / Close up of Goshawk (Accipiter gentilis) feathers, with one foot held up, Trondelag, Norway. Winner of the Attention to Detail Category of the Bird Photographer Competition 2019.

Winfried Wisniewski / White Stork (Ciconia ciconia) on nest, Extremadura, Spain

Jami Tarris / Golden Eagle (Aquila chrysaetos) huntress, Altai Mountains, Bayan Ulgii, Mongolia

Richard Du Toit / Greater Double-collared Sunbird (Nectarinia afra) male on Pincushion (Leucospermum sp) flower, Western Cape, South Africa

Martin Willis / Victoria's Riflebird (Ptiloris victoriae) male in courtship display, Atherton Tableland, Queensland, Australia. Sequence 2 of 3

Martin Willis / Red-collared Lorikeet (Trichoglossus rubritorquis) feeding on flower nectar, Kimberley, Western Australia, Australia

Winfried Wisniewski / Black Kite (Milvus migrans) flying, Castile-La Mancha, Spain

Nick Upton / Captive reared juvenile White stork (Ciconia ciconia) in flight over the Knepp Estate soon after release, Sussex, UK, August 2019.

Nick Upton / Captive reared juvenile White stork (Ciconia ciconia) with a GPS tracker on its back in flight over the Knepp Estate soon after release, Sussex, UK, August 2019.

Jack Dykinga / Burrowing owls (Athene cunicularia) one moving its head - with blurred motion. Marana, Arizona, USA, November.

Alan Murphy/ BIA / Curve-billed Thrasher (Toxostoma curvirostre), Texas

Alan Murphy/ BIA / Barn Owl (Tyto alba) flying with rodent prey, Texas

Alan Murphy/ BIA / Golden-fronted Woodpecker (Melanerpes aurifrons) female, Texas

Alan Murphy/ BIA / Clay-colored Thrush (Turdus grayi) feeding on berries, Texas

Alan Murphy/ BIA / Altamira Oriole (Icterus gularis), Texas

Alan Murphy/ BIA / Harris' Hawk (Parabuteo unicinctus) flying, Texas

Alan Murphy/ BIA / Great Horned Owl (Bubo virginianus), Texas

Alan Murphy/ BIA / Magnolia Warbler (Setophaga magnolia) male, Texas

Alan Murphy/ BIA / Pine Grosbeak (Pinicola enucleator) male, Alaska

Martin Grimm/ BIA / Eurasian Kestrel (Falco tinnunculus) male flying, Baden-Wurttemberg, Germany

Thomas Hinsche/ BIA / Black-crowned Night Heron (Nycticorax nycticorax) juvenile foraging, Hungary

Thomas Hinsche/ BIA / Black-crowned Night Heron (Nycticorax nycticorax) juvenile, Hungary

Thomas Hinsche/ BIA / Black-crowned Night Heron (Nycticorax nycticorax) with fish prey, Hungary

Daniel Brockner/ BIA / Crimson-rumped Toucanet (Aulacorhynchus haematopygus), Mindo, Ecuador

Walter Soestbergen/ BIA / Spotted Nutcracker (Nucifraga caryocatactes) fluffing, Gelderland, Netherlands

Andres M. Dominguez/ BIA / Common Tern (Sterna hirundo) flying with fish prey, Danube Delta, Romania

Markus Johannsen/ BIA / Ring-necked Pheasant (Phasianus colchicus) male, Lower Saxony, Germany

Avi Meir/ BIA / Slender-billed Gull (Larus genei) landing, Eilat, Israel

Markus Johannsen/ BIA / European Greenfinch (Chloris chloris) male, Lower Saxony, Germany

Markus Johannsen/ BIA / European Greenfinch (Chloris chloris) male, Lower Saxony, Germany

Alan Murphy/ BIA / Bald Eagle (Haliaeetus leucocephalus) fishing, Alaska

Alan Murphy/ BIA / Bald Eagle (Haliaeetus leucocephalus) fishing, Alaska

Richard Du Toit / Knysna Turaco (Tauraco corythaix), Garden Route National Park, South Africa

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two males, one brooding young chick, the other incubating hatching egg. Atka Bay, Antarctica. August. Series 4/4.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two males, one brooding young chick, the other incubating hatching egg. Atka Bay, Antarctica. August. Series 3/4.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two males, one brooding young chick, the other incubating hatching egg. Atka Bay, Antarctica. August. Series 2/4.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two males, one brooding young chick, the other incubating hatching egg. Atka Bay, Antarctica. August. Series 1/4.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), group of three males incubating, one with begging chick. Atka Bay, Antarctica. August.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two adults brooding chicks. One chick exhibiting aggression towards other. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two chicks aged six to eight weeks brooding on parents' feet, one vocalising. Atka Bay, Antarctica. September.

Paul Souders/ Worldfoto / Black Heron (Egretta ardesiaca) canopy hunting, Chobe River, Chobe National Park, Botswana

Paul Souders/ Worldfoto / Grey Crowned Crane (Balearica regulorum) flying, Ngorongoro Conservation Area, Tanzania

Shane P. White / Brown Sicklebill (Epimachus meyeri), Kumul Lodge, Papua New Guinea

Jack Dykinga / Burrowing owl (Athene cunicularia) at sunset, standing on one leg, Marana, Sonoran Desert, Arizona, USA. October.

Jack Dykinga / Burrowing owl (Athene cunicularia) with head turned to one side, Marana, Sonoran Desert, Arizona, USA. October.

Donald M. Jones / Yellow-headed Blackbird (Xanthocephalus xanthocephalus) male calling, Montana

Donald M. Jones / Western Meadowlark (Sturnella neglecta) male calling, Montana

Donald M. Jones / Rufous Hummingbird (Selasphorus rufus) female feeding on flower nectar, Montana

Donald M. Jones / Mallard (Anas platyrhynchos) drake flying, Montana

Donald M. Jones / Great Gray Owl (Strix nebulosa), Yaak, Montana

Donald M. Jones / Clay-colored Sparrow (Spizella pallida), Montana

Donald M. Jones / Black-capped Chickadee (Poecile atricapillus) in winter, Troy, Montana

Thomas Marent / Keel-billed Toucan (Ramphastos sulfuratus), native to Central and South America

Thomas Marent / Red-headed Barbet (Eubucco bourcierii) male, Valle del Cauca, Colombia

Thomas Marent / Western Emerald (Chlorostilbon melanorhynchus) hummingbird, Tatama National Park, Colombia

Thomas Marent / Sparkling Violet-ear (Colibri coruscans) hummingbird bathing, Bogota, Colombia

Chase Dekker / Great Gray Owl (Strix nebulosa), Grand Teton National Park, Wyoming

Chase Dekker / Common Loon (Gavia immer) spreading wings, Monterey Bay, California

Tomasz Zawadzki/ BIA / Blue-headed Wagtail (Motacilla flava) calling, Poland

Tomasz Zawadzki/ BIA / Great Reed-Warbler (Acrocephalus arundinaceus) calling, Poland

Glenn Bartley/ BIA / Streamertail (Trochilus polytmus) male feeding on flower nectar, Jamaica

Glenn Bartley/ BIA / Chestnut-bellied Cuckoo (Hyetornis pluvialis) calling, Jamaica

Glenn Bartley/ BIA / Keel-billed Toucan (Ramphastos sulfuratus), Costa Rica

Glenn Bartley/ BIA / Great Curassow (Crax rubra), Costa Rica

Glenn Bartley/ BIA / Black-mandibled Toucan (Ramphastos ambiguus) during rainfall, Costa Rica

Glenn Bartley/ BIA / Blue-winged Mountain-Tanager (Anisognathus somptuosus), Andes, Colombia

Glenn Bartley/ BIA / Patagonian Sierra-Finch (Phrygilus patagonicus) male calling, Andes, Chile

Richard Du Toit / Purple-crested Turaco (Tauraco porphyreolophus), Itala Game Reserve, KwaZulu-Natal, South Africa

Piotr Naskrecki / African Paradise-Flycatcher (Terpsiphone viridis) flying, Gorongosa National Park, Mozambique

Piotr Naskrecki / Mexican Red Rump Tarantula (Brachypelma vagans), Belize

David Perpinan / Rhea (Rhea americana) incubating eggs, gets up and turns one over, Pantanal, Mato Grosso do Sul, Brazil.

Chien Lee / Minden / Magnificent Bird-of-paradise (Cicinnurus magnificus) male at lek, Arfak Mountains, West Papua, Indonesia

Yva Momatiuk & John Eastcott / Minden / Atlantic Puffin (Fratercula arctica), Latrabjarg, Westfjords, Iceland

Sergey Gorshkov / Minden / Northern Goshawk (Accipiter gentilis) feeding on Black Grouse (Tetrao tetrix) female in winter, Finland

Suzi Eszterhas / Mallard (Anas platyrhynchos) rehabilitator, Isabel Luevano, with one day old orphan duckling, International Bird Rescue, Fairfield, California

Michael Quinton / Northern Hawk Owl (Surnia ulula) peering from nest, Alaska

Winfried Wisniewski / Tawny Eagle (Aquila rapax) flying, KwaZulu-Natal, South Africa

Sebastian Kennerknecht / American Black Vulture (Coragyps atratus) flying near skyscrapers, Ancon Hill, Panama City, Panama

Daniel J. Cox / White-tailed Eagle (Haliaeetus albicilla) hunting, Hokkaido, Japan

Chien Lee / Chestnut-capped Laughingthrush (Garrulax mitratus), Kinabalu National Park, Sabah, Malaysia

Richard Du Toit / Cape White-eye (Zosterops capensis) on Cape Honeysuckle (Tecomaria capensis), Garden Route National Park, South Africa

Benjamin Olson / Gentoo Penguin (Pygoscelis papua) wading, Antarctica

Benjamin Olson / Gentoo Penguin (Pygoscelis papua) wet from rain due to climate change, Antarctica

Benjamin Olson / Great Gray Owl (Strix nebulosa), Sax-Zim Bog, Minnesota

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male calling in spring, Maine

Yva Momatiuk & John Eastcott / Atlantic Puffin (Fratercula arctica) with fish prey, Borgarfjordur Eystri, Iceland

Konrad Wothe / Booted Racket-tail (Ocreatus underwoodii) feeding on flower nectar, Ecuador

Chien Lee / Common Potoo (Nyctibius griseus) mimicking branch, Utria National Park, Colombia

Chien Lee / Plate-billed Mountain-Toucan (Andigena laminirostris), Mindo, Ecuador

Chien Lee / Plate-billed Mountain-Toucan (Andigena laminirostris), Mindo, Ecuador

Alan Murphy/ BIA / Myrtle Warbler (Setophaga coronata coronata), Texas

Alan Murphy/ BIA / Red-winged Blackbird (Agelaius phoeniceus) male, Texas

Alan Murphy/ BIA / Sharp-tailed Grouse (Tympanuchus phasianellus) male displaying at lek in snow, Minnesota

Marion Vollborn/ BIA / Bald Eagle (Haliaeetus leucocephalus) flying, Alaska

Gerald Haas/ BIA / Lanner Falcon (Falco biarmicus), Etosha National Park, Namibia

Alan Murphy/ BIA / Peregrine Falcon (Falco peregrinus) flying, Texas