Markus Varesvuo / Willow grouse (Lagopus lagopus) Kiilopaa, Inari, Finland, January.

Markus Varesvuo / Black grouse (lyrurus tetrix) female and chick at nest, Vaala, Finland, June.

Denis-Huot / Village weaver bird (Ploceus cucullatus) male building a nest after the rains, Masai-Mara Game Reserve, Kenya. February.

Tui De Roy / Little blue / fairy penguin (Eudyptula minor) pair courting near nesting burrow, Neck Game Reserve, Bruny Island, Tasmania, Australia, December.

Tui De Roy / Little blue / fairy penguin (Eudyptula minor) walking on pathway to nesting burrows, Neck Game Reserve, Bruny Island, Tasmania, Australia, December.

Thomas Hinsche / Ring-necked Pheasant (Phasianus colchicus) male in terriorial display, Texel, Netherlands

Fabian Fopp / Rock Ptarmigan (Lagopus muta), Grisons, Switzerland

Mark Raycroft / Willow Ptarmigan (Lagopus lagopus) camouflaged on autumn tundra

Markus Varesvuo / Willow Grouse (Lagopus lagopus) in flight over snowy landscape, Utsjoki, Finland April

Markus Varesvuo / Capercaillie (Tetrao urogallus) male calling with female, Jalasjarvi, Finland, April

Markus Varesvuo / Black Grouse (Tetrao tetrix) displaying with breath vapor at dawn, Utajarvi, Finland, April

Markus Varesvuo / Black Grouse (Tetrao tetrix) female on frosty branches, Kuusamo, Finland April

Bob Steele / Sage Grouse (Centrocercus urophasianus) male displaying to female at lek, Mono County, California

Thomas Hinsche / Ring-necked Pheasant (Phasianus colchicus) male, Texel, Netherlands

Glenn Bartley / Willow Ptarmigan (Lagopus lagopus) male, Manitoba, Canada

Denis-Huot,Denis-Huot / Kori bustard (Ardeotis kori) walking in grass burnt in bushfire, Masai-Mara Game Reserve, Kenya

Denis-Huot,Denis-Huot / Lappet-faced vultures (Torgos tracheliotus) interacting, Masai-Mara Game Reserve, Kenya,

Denis-Huot,Denis-Huot / White-backed Vulture (Gyps Africanus) feeding, Masai-Mara Game Reserve, Kenya

Denis-Huot,Denis-Huot / Ostrich (Struthio camelus) female and male with chicks, Masai-Mara Game Reserve, Kenya

Denis-Huot,Denis-Huot / Ostrich (Struthio camelus) female portrait, Masai-Mara Game Reserve, Kenya

Denis-Huot,Denis-Huot / Marabou stork (Leptoptilos crumeniferus) with a turtle prey, Masai-Mara Game Reserve, Kenya

Denis-Huot,Denis-Huot / Lesser flamingo (Phoeniconaias minor) aerial view of flock and geyser, Bogoria Game Reserve, Kenya

Markus Varesvuo / Male Capercaillie (Tetrao urogallus) flying in woodland, Vaala, Finland, April.

Markus Varesvuo / Male Capercaillie (Tetrao urogallus) flying in woodland, Vaala, Finland, April.

Ernie Janes / Grey Partridge (Perdix perdix) in tulip field, Norfolk

Ben Hall,Ben Hall / Red grouse (Lagopus lagopus scotica) sitting in flowering heather, Peak District, UK, September

David Tipling / 2020VISION / Grey Partridge (Perdix perdix) on a bare field, Norfolk, England, UK, April. Did you know? Partridges have the largest number of eggs in a clutch of any bird species, the highest number recorded being...

Steve Gettle / Wood Duck (Aix sponsa) male swimming, Lapeer State Game Area, Michigan

Steve Gettle / Wood Duck (Aix sponsa) male in breeding plumage, Lapeer State Game Area, Michigan

Steve Gettle / Wood Duck (Aix sponsa) male in breeding plumage, Lapeer State Game Area, Michigan

Steve Gettle / Wood Duck (Aix sponsa) male flying, Lapeer State Game Area, Michigan

Ben Hall / 2020VISION / Red grouse (Lagopus lagopus scoticus) on heather moorland showing habitat, Peak District National Park, UK, September. Did you know? Red grouse thrive on managed moorlands the UK has at least 155,000...

Steve Gettle / Spruce Grouse (Falcipennis canadensis) male, Michigan

Steve Gettle / Sharp-tailed Grouse (Tympanuchus phasianellus) male displaying at lek, Seney National Wildlife Refuge, Michigan

Mark Hamblin / 2020VISION / Black grouse (Tetrao tetrix) male at lek, Creag Megaidh NNR, Highlands, Scotland, UK, April

Peter Cairns / 2020VISION / Capercaillie (Tetrao urogallus) male displaying in pine forest in snow, Cairngorms NP, Highlands, Scotland, UK, January. Photographer quote: 'The capercaillie is Britain's fastest declining bird and r...

Fergus Gill / Red grouse (Lagopus lagopus scoticus), portrait of a cock bird displaying to rival males. Cairngorms National Park, Scotland, April

Fergus Gill / Red grouse (Lagopus lagopus scoticus), portrait of a cock bird. Cairngorms National Park, Scotland, April

Matthias Breiter / Ruffed Grouse (Bonasa umbellus) male drumming, Kenora, Ontario, Canada

Vincent Grafhorst / Cape Teal (Anas capensis) standing in shallow water, Gaborone Game Reserve, Botswana

Stephen Dalton / Pheasant (Phasianus colchicus) male on garden bird feeder in the snow, Winter, UK

Donald M. Jones / Blue Grouse (Dendragapus obscurus) male displaying, western Montana

Donald M. Jones / Wild Turkey (Meleagris gallopavo) male displaying, western Montana

Theo Allofs / Lechwe (Kobus leche) and Cattle Egret (Bubulcus ibis) in Moremi Game Reserve, Okavango Delta, Botswana

Patricio Robles Gil / Gambel's Quail (Callipepla gambelii) adult perched atop a blooming cactus, El Pinacate/Gran Desierto de Altar Biosphere Reserve, Sonora, Mexico

Michael Quinton / Ruffed Grouse (Bonasa umbellus) male in courtship display, North America

Konrad Wothe / Lesser Kestrel (Falco naumanni) female flying, Turkey

Tim Fitzharris / Greater Prairie Chicken (Tympanuchus cupido) male in courtship display, Eagle Lake, Texas

Gerry Ellis / Wild Turkey (Meleagris gallopavo) pair, North America

Gerry Ellis / Indian Peafowl (Pavo cristatus) male display feathers, native to India and southeast Asia

Gerry Ellis / Wild Turkey (Meleagris gallopavo) in woodlands, eastern North America

Michael Quinton / Willow Ptarmigan (Lagopus lagopus) with fall plumage perching on branch, Alaska

Michael Quinton / Willow Ptarmigan (Lagopus lagopus) in winter plumage, Alaska

Michael Quinton / Willow Ptarmigan (Lagopus lagopus) with camouflaged winter plumage in snow burrow, Alaska

Tui De Roy / Bare-faced Curassow (Crax fasciolata) male in typical Cerrado habitat, Emas National Park, Brazil

Ann & Steve Toon / Tawny eagle (Aquila rapax) in flight, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Warthog (Phacochoerus africanus) with Redbilled oxpecker (Buphagus erythrorhynchus), Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Warthog (Phacochoerus africanus) drinking, with redbilled oxpeckers (Buphagus erythrorhynchus), Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Warthog (Phacochoerus africanus) drinking, with redbilled oxpecker (Buphagus erythrorhynchus), Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Greenbacked heron (Butorides striatus) peering from perch, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Woolly-necked stork (Ciconia episcopus) with frog, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Woolly-necked stork (Ciconia episcopus), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Marabou (Leptoptilos crumenifer) with White-backed vulture (Gyps africanus) Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Blue waxbills (Uraeginthus angolensi) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Blue waxbills (Uraeginthus angolensi) and redbilled firefinches (Lagonosticta senegala) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Arrow-marked babblers (Turdoides jardineii) by water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Redbilled oxpecker (Buphagus erythrorhynchus) searching for insects on Warthog (Phacochoerus africanus), Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Kittlitz's plover (Charadrius pecuarius) egg, Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Greenbacked heron (Butorides striatus) walking through water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Woolly-necked stork (Ciconia episcopus) with frog, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Hamerkop (Scopus umbretta) eating frog, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Common waxbills (Estrilda astrild) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Southern greyheaded sparrows (Passer diffusus) reflected in waterhole, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Redbilled oxpecker (Buphagus erythrorhynchus) drinking from perch on warthog, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Red-billed firefinch (Lagonosticta senegala), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Red-billed firefinch (Lagonosticta senegala), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Pink-throated twinspot (Hypargos margaritatus), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Green-winged pytilia (Pytilia melba) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Fork-tailed drongo (Dicrurus adsimilis), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Pied crow (Corvus albus) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Whitenecked ravens (Corvus albicollis), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Pied crow (Corvus albus) pulling tail feather of whitebacked vulture, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Pied crow (Corvus albus) pulling tail feather of whitebacked vulture, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Crested barbet (Trachyphonus vaillantii), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Crested barbet (Trachyphonus vaillantii) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Black crake (Amaurornis flavirostra), Zimanga game reserve, KwaZulu-Natal, South Africa, May

Ann & Steve Toon / Helmeted guineafowl (Numida meleagris), Chobe National Park, Botswana.

Ann & Steve Toon / Crested guineafowl (Guttera pucherani), Zimanga game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Crested francolin (Dendroperdix sephaena), Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Namaqua dove (Oena capensis) at water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Cape turtle dove (Streptopilia capicola) bathing, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Burchell's coucal (Centropus burchellii), Zimanga game reserve, South Africa.

Ann & Steve Toon / Southern redbilled hornbill (Tockus rufirostris), Zimanga game reserve, South Africa.

Ann & Steve Toon / Whitebacked vultures (Gyps africanus) mating, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Whitebacked vulture (Gyps africanus) chased by spotted hyena, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Whitebacked vulture (Gyps africanus) chased by spotted hyena, Zimanga private game reserve, KwaZulu-Natal, South Africa.