Loic Poidevin / Northern ravens (Corvus corax) interacting in snow, Leon, Spain, February.

Philippe Clement / Territorial Common raven (Corvus corax) on cliff top, tearing out vegetation, Eshaness, Northmavine, Shetland Islands, Scotland, UK, May.

Philippe Clement / Common raven (Corvus corax) taking off from the top of a sea cliff, Eshaness, Northmavine, Shetland Islands, Scotland, UK, May.

Philippe Clement / Common raven (Corvus corax) calling from top of sea cliff, Eshaness, Northmavine, Shetland Islands, Scotland, UK, May.

Dave Bevan / Common raven (Corvus corax) flying to nest to feed fledglings, Carmarthenshire, Wales, UK, May.

Ingo Arndt / Thick billed ravens interacting {Corvus crassirostris} Simien NP, Ethiopia, East Africa

Mark Hamblin / Raven (Corvus corax) adult calling from rock in mountain habitat, Scotland, UK. November. Third place in British Birds Bird Photograph of the Year competition 2016.

Donald M. Jones / Common Raven (Corvus corax) walking in snow, western Alberta, Canada

Donald M. Jones / Common Raven (Corvus corax) walking in snow, western Alberta, Canada

Donald M. Jones / Common Raven (Corvus corax) in snow, western Alberta, Canada

Staffan Widstrand / Raven (Corvus corax) mobbing Gyrfalcon (Falco rusticolus), Hornoya Island, Varanger Peninsula, Norway, March.

Sven Zacek / Ravens (Corvus corax) fighting in bog during snowfall, Tartumaa, Estonia. December.

Espen Bergersen / Common raven (Corvus corax) pair in courtship display, flying upsidedown and calling, Hornoya bird cliff, Norway. March.

Espen Bergersen / Gyrfalcon (Falco rusticolus) and Raven (Corvus corax) in flight, Hornoya bird cliff, Finnmark, Norway. March

Markus Varesvuo / Seven Ravens (Corvus corax) perched on dead tree in the snow, Utajrvi, Finland, February

Markus Varesvuo / Raven (Corvus corax) in flight, Kuusamo, Finland, April

Markus Varesvuo / Common raven (Corvus corax) in flight, Kuhmo, Finland, March

Markus Varesvuo / Golden Eagle (Aquila chrysaetos) in flight being harrassed by raven. Utajrvi, Finland. February

Markus Varesvuo,Markus Varesvuo / Pair of Common ravens (Corvus corax) displaying, Vardo, Norway, March.

Markus Varesvuo,Markus Varesvuo / Commen raven (Corvus corax) flying in falling snow, Vardo, Norway, March.

Markus Varesvuo / Raven (Corvus corax) in flight, Norway, April

Juan Carlos Munoz / Bearded vulture (Gypaetus barbatus) chasing Thick-billed Raven (Corvus crassirostris) in flight. Simien National Park, Ethiopia, Africa.

Markus Varesvuo / Common Raven (Corvus corax) two in flight during snow storm, Kuusamo, Finland April

Markus Varesvuo / Common Raven (Corvus corax) huddled down amidst snow storm, Utajarvi Finland, February

Staffan Widstrand / Eurasian / Grey wolf (Canis lupus) watching flying flock of Common raven (Corvus corax) Kuhmo, Finland. September.

Juan Carlos Munoz / Two White Tailed Sea Eagle (Haliaeetus albicilla) fighting in acrobatic flight as Raven (Corvus corax) looks on. Scandinavia, April. 5th, 2010 Euronatur Wildlife photographer competition.

Juan Carlos Munoz / Two White Tailed Sea Eagle (Haliaeetus albicilla) fighting in acrobatic flight as Raven (Corvus corax) looks on and a Herring Gull (Larus argentus) flies past. Scandinavia, April.

Juan Carlos Munoz / White Tailed Sea Eagles (Aliaeetus albicilla) flying above snow with a Raven (Corvus corax) landed. Scandinavia, Europe, April.

Lassi Rautiainen / Two Common ravens (Corvus corax) in flight through snow, Finland, April

Lassi Rautiainen / Common raven (Corvus corax) perched in snow beside birch tree, Finland, March

Markus Varesvuo / Raven (Corvus corax) in flight, Norway, April

Niall Benvie / A pair of Ravens (Corvus corax) perched in bleached out pine tree, Estonia, March 2008

Wild Wonders of Europe / Elander / Griffon vulture (Gyps fulvus) and Raven (Corvus corax) in snow, Cebollar, Torla, Aragon, Spain, November 2008

Wild Wonders of Europe / Máté / Raven (Corvus corax) in flight carrying food, Fisher pond, Prypiat area, Belarus, June 2009

Wild Wonders of Europe / Hermansen / Common raven (Corvus corax) calling, beak open, The Burren, County Clare, Republic of Ireland, June 2009

Wild Wonders of Europe / Hermans / Raven (Corvus corax) Cliffs of Moher, Republic of Ireland, June 2009

Wild Wonders of Europe / Hermansen / Raven (Corvus corax) in flight, silhouetted, The Burren, County Clare, Republic of Ireland, June 2009

Wild Wonders of Europe / Hermans / Raven (Corvus corax) on cliff top, Cliffs of Moher, County Clare, Republic of Ireland, June 2009

Wild Wonders of Europe / Hermansen / Raven (Corvus corax) in flight, The Burren, County Clare, Republic of Ireland, June 2009

Angelo Gandolfi / Raven (Corvus corax). Atlas range, Morocco.

Wild Wonders of Europe / Relanzón / Common raven (Corvus corax) perched on rock, La Caldera de Taburiente National Park, La Palma, Canary Islands Spain, March 2009

Guy Edwardes / Common raven {Corvus corax} in flight, Gigrin Farm, Rhayader, Powys, Wales, UK, January

Ian McCarthy / Common raven {Corvus corax} landing on snow, Bryce Canyon NP, Utah, USA

Rolf Nussbaumer / Common raven, juvenile {Corvus corax} Norway.

Michael Quinton / Common Raven (Corvus corax) checking out tourist, Yellowstone National Park, Wyoming

Michael Quinton / Common Raven (Corvus corax) using its beak to open a snowmobile's storage compartment in search of food, Yellowstone National Park, Wyoming

Jim Brandenburg / Raven Lake surrounded by autumn colored forest, Minnesota

Mike Read / Common buzzard {Buteo buteo} and Raven {Corvus corax} share rabbit carcass. Wales, UK

Dietmar Nill / Common raven portrait (Corvus corax) Germany

Georgette Douwma / Raven (Corvus corax) standing on grassy cliff top. England UK

Bengt Lundberg / Common raven (Corvus corax) juveniles in tree Sweden

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

George Sanker / Raven (Corvus corax), two fighting in mid-air. Yellowstone National Park, Wyoming, USA. June.

Loic Poidevin / Northern raven (Corvus corax) stealing egg from Gull's nest on cliff face. Hornoya Island, Varanger, Norway. May,

Nick Upton / Raven (Corvus corax) perched on fence post among flowering Common gorse bushes (Ulex europaeus) on a clifftop with the sea in the background, Cornwall, UK, April.

Nick Upton / Raven (Corvus corax) perched on fence post among flowering Common gorse bushes (Ulex europaeus) on a clifftop with the sea in the background, Cornwall, UK, April.

Loic Poidevin / Northern raven (Corvus corax) in flight, Leon, Spain, February.

Loic Poidevin / Northern raven (Corvus corax) in snow, Leon, Spain, February.

Nick Hawkins / Atlantic sea raven (Hemitripterus americanus) along the off Nova Scotia, Canada. July.

Nick Hawkins / Atlantic sea raven (Hemitripterus americanus) along the off Nova Scotia, Canada. July.

Jed Weingarten / Wild Wonders of China / Himalayan griffon vulture (Gyps himalayensis) in mountain landscape with a Raven (Corvus corax) Serxu County, Garze Prefecture, Sichuan Province, China.

Juan Carlos Munoz / Raven (Corvus corax) portrait. Spain. October 2018.

Nick Upton / Raven (Corvus corax) flying off low over pebbly beach with scavenged crisp left by picknickers, Cornwall, UK, April.

Loic Poidevin / Northern ravens (Corvus corax) squabbling whilst carrying berries, Creu du Van, Jura Switzerland, September

Philippe Clement / Common raven / northern raven (Corvus corax) calling from top of sea cliff along the coast, Scotland, UK, May

Philippe Clement / Two juvenile Common ravens (Corvus corax) perched above a sea cliff, Eshaness, Northmavine, Shetland Islands, Scotland, UK, May.

Philippe Clement / Three juvenile Common ravens (Corvus corax) perched above a sea cliff, Eshaness, Northmavine, Shetland Islands, Scotland, UK, May.

David Tipling / Common raven (Corvus corax) displaying Extremadura, Spain. December

Jack Dykinga / Raven (Corvus corax) with nictitating membrane over eye, in a blizzard on Hurricane Ridge, Olympic National Park, Washington, USA. Sequence 2/2

Jack Dykinga / Raven (Corvus corax) in a blizzard on Hurricane Ridge, Olympic National Park, Washington, USA. Nictitating membrane sequence 1/2

Alain Dragesco-Joffe / Brown-necked raven (Corvus ruficollis) calling, Tenere, Sahara, Niger.

Loic Poidevin / Northern raven (Corvus corax) pair perching on branch. Danube Delta, Romania, May.

Loic Poidevin / Northern raven (Corvus corax) perched on a branch. Danube Delta, Romania. May.

Loic Poidevin / Northern raven (Corvus corax) perched on a branch. Danube Delta, Romania. May.

Eric Medard / Common raven (Corvus corax) two calling in mist, Pyrenees, France, March.

Eric Medard / Common ravens (Corvus corax) preening each other, Pyrenees, France. March.

Eric Medard / Common raven (Corvus corax) calling, Pyrenees, France. March.

Robin Chittenden / Northern raven (Corvus corax tingitanus) perched on fence, Fuerteventura, Canary Islands, Spain. February.

Dave Bevan / Common raven (Corvus corax) fledglings about to leave nest in fir tree, Carmarthenshire, Wales, UK, May.

Dave Bevan / Common raven (Corus corax) fledglings preparing to leave nest, Carmarthenshire, Wales, UK, April.

Dave Bevan / Female Common raven (Corus corax) flying to nest and feeding chicks, Carmarthenshire, Wales, UK, April.

Dave Bevan / Male Common raven (Corus corax) feeding young in nest, Carmarthenshire, Wales, UK, April.

Espen Bergersen / Gyrfalcon (Falco rusticolus) chased by Raven (Corvus corax). Hornoya birdcliff, Vardo, Norway. March

Espen Bergersen / Gyrfalcon (Falco rusticolus) chased by Raven (Corvus corax). Hornoya birdcliff, Vardo, Norway. March

Roger Powell / Common raven (Corvus corax) flying off with food scavenged at the tideline. Langbuness, Varanger fjord, Finnmark, Norway, May.

Nick Upton / Canary Island Raven (Corvus corax tingitanus) adult perched on sea cliff edge with sea in the background, Fuerteventura, Canary Islands, May. This is the smallest subspecies of Raven, restricted to Mo...

Nick Upton / Canary Island Raven (Corvus corax tingitanus) adult perched on sea cliff edge with surfers in the background, Fuerteventura, Canary Islands, May. This is the smallest subspecies of Raven, restricted t...

Nick Upton / Canary Island Raven (Corvus corax tingitanus) adult perched on sea cliff edge with sea in the background, Fuerteventura, Canary Islands, May. This is the smallest subspecies of Raven, restricted to Mo...

Johannes Melchers/ BIA / Common Raven (Corvus corax) calling, Finnmark, Norway

Nick Upton / Raven (Corvus corax) in flight over the sea, Dorset, UK, April.

Nick Upton / Raven (Corvus corax) adult perched on fence post in coastal grassland, Lulworth Cove, Dorset, UK, April.

Nick Upton / Raven (Corvus corax) adult perched on fence post in coastal grassland, Lulworth Cove, Dorset, UK, April.

Nick Upton / Raven (Corvus corax) adult perched on sea cliff edge with sea in the background, Dorset, UK, April.

Bruno D'Amicis / Raven (Corvus corax) perched on a rock in the rain. Central Apennines, Abruzzo, Italy, January.

Sandra Bartocha / Ravens (Corvus corax), Lentiira, Finland. September.

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