Steven David Miller / Emu (Dromaius novaehollandiae) juvenile with beak open to catch a leaf, Cleland Wildlife Park, South Australia, March. Captive.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) male feeding chick aged a few days. Atka Bay, Antarctica. August. Sequence 1/2.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) male feeding chick aged a few days. Atka Bay, Antarctica. August.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick begging for food, on parent's feet. Atka Bay, Antarctica. August.

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

Paul Hobson / Keel-billed toucan (Ramphastos sulfuratus) perched on branch with beak open. Laguna del Lagarto, Alajuela, Costa Rica.

Paul Hobson / Wood warbler (Phylloscopus sibilatrix) singing whilst perched on branch, silhouetted at dawn. Sheffield, England, UK. May.

Guy Edwardes / Little bee-eater (Merops pusillus) vocalising whilst perched on branch, Khwai, Botswana.

Ingo Arndt / Male Vogelkop Bowerbird (Amblyornis inornatus) constructing bower roof. Arfak Mountains, West Papua, Indonesia.

Ingo Arndt / Glaucous winged gull (Larus glaucescens) calling, Lake Clark National Park, Alaska, USA, August

Bence Mate / White tailed sea eagle (Halieetus albicilla) head portrait beak open calling, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary, January.

Bence Mate / Dalmatian pelicans (Pelecanus crispus) low angle perspective of open bills whilst feeding, Lake Kerkini, Greece, February.

Bence Mate / Grey heron (Ardea cinerea) close up with large fish in beak, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.

Bence Mate / Dalmatian pelicans (Pelecanus crispus) low angle perspective of open bills whilst feeding, Lake Kerkini, Greece, February.

Bence Mate / Great egret (Ardea alba) with green colouring near beak during breeding season, Lake Csaj, Pusztaszer, Hungary, April.

Bence Mate / Dalmatian pelicans (Pelecanus crispus) low angle perspective of open bills whilst feeding, Lake Kerkini, Greece, February.

Bence Mate / Dalmatian pelicans (Pelecanus crispus) low angle perspective of open bills whilst feeding, Lake Kerkini, Greece, February.

Bence Mate / Dalmatian pelicans (Pelecanus crispus) low angle perspective of open bills whilst feeding, Lake Kerkini, Greece, February. Highly commended in World of Birds category in the Cadiz Photo Nature Competi...

Wim van den Heever / Bare-faced curassow (Crax fasciolata) portrait of female, Pantanal, Brazil.

Wim van den Heever / Pied avocet (Recurvirostra avosetta) feeding in shallow water at dawn, Etosha National Park, Namibia.

Markus Varesvuo / Female Capercaillie (Tetrao urogallus) with newly hatched chick on nest, Kuhmo, Finland, June.

Markus Varesvuo / Golden eagle (Aquila chrysaetos) plucking Capercaillie (Tetrao urogallus) Kuusamo, Finland, April.

Sven Zacek / Ural owl (Strix uralensis) chick trying to climb an aspen tree with its beak, talons and wings, Southern Estonia. June.

Claudio Contreras / Caribbean flamingo (Phoenicopterus ruber) adult feeding chick, Ria Lagartos Biosphere Reserve, Yucatan Peninsula Mexico, June. Winner of the CONABIO Nature Photography Competition 2015.

Bence Mate / Grey heron (Ardea cinerea) and Great egret (Ardea alba) fighting over fish, Lake Csaj, Pusztaszer, Hungary, December. Winner of the Portfolio category of the Terre Sauvage Nature Images Awards competi...

Bence Mate / Great egret (Ardea alba) hunting fish, Lake Csaj, Pusztaszer, Hungary, February. Winner of the Portfolio category of the Terre Sauvage Nature Images Awards competition 2015.

Bence Mate / Two Great egrets (Ardea alba) face to face against white sky, Lake Csaj, Pusztaszer, Hungary. Winner of the Portfolio category of the Terre Sauvage Nature Images Awards competition 2015.

Suzi Eszterhas / Hyacinth macaw (Anadorhynchus hyacinthinus) eating palm nut. Pantanal, Brazil.

Dave Watts / Northern bald ibis (Geronticus eremita) feeding, Morocco, Critically endangered species.

Marie Read / Horned puffin (Fratercula corniculata) close-up portrait, St. Paul Island, Pribilofs, Alaska, USA, July.

Marie Read / Tufted puffin (Fratercula cirrhata), close-up portrait, St. Paul Island, Pribilofs, Alaska, USA, July.

Cyril Ruoso / Atlantic puffin (Fratercula arctica) seen from burrow, Iceland. July.

Angelo Gandolfi / Gannets (Morus bassanus) courtship behavior on nest on abandoned boat, La Spezia Gulf, Italy. Mediterranean Sea. July.

Andy Rouse / Great crested grebe (Podiceps cristatus cristatus) courtship weed dance, Cardiff, UK, March.

Andy Rouse / Great crested grebe (Podiceps cristatus cristatus) courtship dance at dawn, Cardiff, UK, March.

Anup Shah / Marabou storks (Leptoptilos crumeniferus) feeding on catfish in waterhole, wide angle view. Maasai Mara National Reserve, Kenya.

Staffan Widstrand / Common Eurasian buzzard (Buteo buteo) reflected in water whilst drinking, Pusztaszer protected landscape, Kiskunsagi, Hungary, May

Staffan Widstrand / Great white egret (Egretta alba or Ardea alba) catching cyprionid fish or carp in fish farm, Pusztaszer Protected Landscape, Kiskunsagi, Hungary, May

Krijn Trimbos / Great crested grebe (Podiceps cristatus) pair in courtship display, The Netherlands. March.

Krijn Trimbos / Great crested grebe (Podiceps cristatus) with head low to the water in aggressive display, The Netherlands. March.

Krijn Trimbos / Great crested grebe (Podiceps cristatus) pair in courtship display, The Netherlands. March.

Gabriel Rojo / Bay-winged cowbird,(Agelaioides badius) chicks begging for food, La Pampa, Argentina

Gabriel Rojo / Scimitar-billed woodcreeper (Drymornis bridgesii) at nest hole, Calden forest, La Pampa, Argentina.

Espen Bergersen / Common guillemot (Uria aalge) calling, bridled guillemot morph with white ring around the eye, Hornoya bird cliff, Finnmark, Norway. March.

Espen Bergersen / Atlantic puffin (Fratercula arctica) two birds fighting at nesting ground, Hornoya bird cliff, Finnmark, Norway. March.

Espen Bergersen / Atlantic puffins (Fratercula arctica) group interacting, Hornoya bird cliff, Finnmark, Norway. March.

Espen Bergersen / Atlantic puffin (Fratercula arctica) and European shag (Phalacrocorax aristotelis) Hornoya, Finnmark, Norway. March.

Nick Upton / Adult Herring gull (Larus argentatus) scavenging left over food, St.Ives, Cornwall, UK, June. Editorial use only.

Danny Green / Steller's sea eagle (Haliaeetus pelagicus) on snowy ground, Japan, February

Danny Green / Steller's sea eagle (Haliaeetus pelagicus) close up portrait, Japan, February

Danny Green / Japanese crane (Grus japonensis) displaying, wings in heart shape, Hokkaido, Japan, February

Cyril Ruoso / Pygmy kingfisher (Ceyx picta) portrait, Cross River State, Nigeria. Non-ex

Ole Jorgen Liodden / Red-chested Sunbird (Cinnyris erythrocercus) backlit on flower, Rwanda.

Ole Jorgen Liodden / Magnificent frigatebird (Fregata magnificens) male with gular pouch, Galapagos.

Ole Jorgen Liodden / Blue-footed booby (Sula nebouxii exisa) displaying, Galapagos Islands.

Ole Jorgen Liodden / Woodpecker finch (Camarhynchus pallidus) using stick as a tool for foraging, Galapagos. Endemic.

Ole Jorgen Liodden / Common sandpiper (Actitis hypoleucos) singing with tongue visible, Norway, June.

Ole Jorgen Liodden / Waved albatross (Phoebastria irrorata) pair in courtship display, Espanola, Galapagos Islands. Critically endangered species.

Ole Jorgen Liodden / Barn swallow (Hirundo rustica) in mud collecting nesting material, collecting nesting material, with golden bokeh affect in puddle, Svalbard, Norway, June.

Ole Jorgen Liodden / Brown pelican (Pelecanus occidentalis urinator) close up of throat pouch skin, with beak open, Galapagos.

Ole Jorgen Liodden / Atlantic puffin (Fratercula arctica arctica) in flight carrying sandeels and larger fish, Hornoya, Vardo, Norway, July.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) underwater, Punta Vicente Roca, Isabela Island, Galapagos, Ecuador, April.

Markus Varesvuo / Blackcap (Sylvia atricapilla) feeding on berries, Uto, Finland, October.

Markus Varesvuo / Jack snipe (Lymnocryptes minimus), Uto, Finland, November.

Markus Varesvuo / Great white egret (Ardea alba) splashing, Hungary, January.

Hanne & Jens Eriksen / Ruppell's weaver (Ploceus galbula) male building nest, Oman, May

Marie Read / Royal terns (Sterna maxima) pair crossing bills during courtship behaviour, Fort DeSoto Park, Florida, USA

Tui De Roy / Erect-crested penguins (Eudyptes sclateri) portrait, Proclamation Island, Bounty Islands, New Zealand Sub-Antarctic Islands. Endemic to Antipodes and Bounty Islands. Endangered species.

Tui De Roy / Erect-crested penguins (Eudyptes sclateri) pair on coast, Proclamation Island, Bounty Islands, New Zealand Sub-Antarctic Islands. Endemic to Antipodes and Bounty Islands. Endangered species.

Tui De Roy / Snares Crested penguin (Eudyptes robustus) bathing in freshwater pool, Snares Island, New Zealand Sub-Antarctic Islands. Endemic and vulnerable species.

Tui De Roy / Erect-crested penguins (Eudyptes sclateri) feeding young chick. Antipodes Island, New Zealand Sub-Antarctic Islands. Endemic to Antipodes and Bounty Islands. Endangered species.

Tui De Roy / Erect-crested penguin (Eudyptes sclateri) pair in greeting display. Antipodes Island, New Zealand Sub-Antarctic Islands. Endemic to Antipodes and Bounty Islands. Endangered species.

David Pattyn / Great crested grebe (Podiceps cristatus) close-up of an adult with two young chicks. The Netherlands. June 2014

Espen Bergersen / Male Steller's eider (Polysticta stelleri) drinking on water with reflections of nearby buildings. Batsfjord, Norway. March.

Espen Bergersen / Adult male King eider (Somateria spectabilis) close up portrait, Batsfjord, Norway, March.

Bence Mate / Great egret (Ardea alba) and Grey heron (Ardea cinerea) fighting over a fish, Lake Csaj, Kiskunsagi National Park, Hungary

Michel Poinsignon / Kingfisher(Alcedo atthis) male perched on branch over river with fish in beak, Lorraine, France. May.

Markus Varesvuo / Red-crowned Cranes (Grus japonensis) displaying and calling in snow, Hokkaido, Japan, February

Markus Varesvuo / Great White Egret (Egretta alba) with water splashing from beak, Hungary January

Andy Trowbridge / Common Sandpiper (Actitis hypoleucos) perched on stump calling. Tomter, Southern Norway. July.

Ben Cranke / European Herring Gull (Larus argentatus) landing on the waters of a fjord, Norway, May.

Ben Cranke / Steller's Sea Eagle (Haliaeetus pelagicus) stood on ice floe, Hokkaido, Japan. February.

Ben Cranke / Hyacinth Macaw (Anodorhynchus hyacinthinus) Piaui, Brazil. July.

Ben Cranke / Steller's Sea Eagle (Haliaeetus pelagicus) portrait, Hokkaido, Japan. February.

Ben Cranke / Steller's Sea Eagle (Haliaeetus pelagicus) in flight, Hokkaido, Japan. February.

Ben Cranke / Hyacinth Macaws (Anodorhynchus hyacinthinus) grooming each other, Piaui, Brazil. August.

Matthew Maran / Mute swans (Cygnus olor) Highgate Ponds, Hampstead Heath, London, UK, February.

Markus Varesvuo / Herring Gull (Larus argentatus) calling, Lokka, Finland, May

Nick Garbutt / Adult Helmet Vanga (Euryceros prevostii) incubating a clutch of 3 eggs. Nest constructed in the fork of a Bird's Nest Fern (Asplenium sp.) Masoala National Park, north east Madagascar.

Bence Mate / Great reed warbler (Arcocephalus arundinaceus) chick begging for food, with bokeh affect from water, Pusztaszer, Hungary, June.

Bence Mate / Great egret (Ardea alba) feeding on fish, Pusztaszer, Hungary, June.

Bence Mate / Grey heron (Ardea cinerea) catching fish, taken with remote camera, Pusztaszer, Hungary, June.

Bence Mate / Hooded crow (Corvus coronix) and Eurasian Magpie (Pica pica) waiting to scavenging White tailed eagle's (Haliaeetus albicilla) food, Pusztazer, Hungary.

Andy Trowbridge / Puffin (Fratercula arctica) standing on Sea thrift (Armeria maritima) with wings out stretched with a beak full of sand eels. Close-up portrait. Fair Island, Shetland Islands, Scotland, July.

Andy Trowbridge / Atlantic Puffin (Fratercula arctica) in flight, coming into land with beak full of sand eels (Ammodytes tobianus). Fair Isle, Shetland Islands, Scotland, UK, July.