Emmanuel Rondeau / Ring-necked pheasant (Phasianus colchicus) walking along a wildlife underpass below the A89 highway and above the Deirot river, Correze, France. September. Camera trap image.

Pal Hermansen / King eiders (Somateria spectabilis), Eiders (Somateria mollissima) and Gulls (Larus sp.) in fishing harbour. During the winter time the birds gather in harbour to feed on fish waste, Batsfjord, Finnma...

Pal Hermansen / King eider (Somateria spectabilis) on water in fishing harbour, Batsfjord, Finnmark, Norway. February.

Pal Hermansen / Mallard ducks (Anas platyrhynchos) flock in winter, portrait, Oslo, Norway. December.

Pal Hermansen / Group of Starlings (Sturnus vulgaris) feeding on food scraps left on plates at an outdoor restaurant, Hyde Park, London, England, UK. October.

Pal Hermansen / Greylag goose (Anser anser) resting with head tucked under wing, Hyde Park, London, England, UK. October.

Pal Hermansen / Two Eurasian cranes (Grus grus) walking across frozen lake, Varmland, Sweden. April.

Pal Hermansen / Two Whooping swans (Cygnus cygnus) on misty river in freezing temperatures at dawn, Golsfjell, Viken, Norway. February.

Pal Hermansen / Dipper (Cinclus cinclus) perched on rock in frozen river, Follo, Norway. February.

Pal Hermansen / Sunbittern (Eurypyga helias) wading in river, Costa Rica.

Pal Hermansen / Goosander (Mergus merganser) male, taking flight from water in snowfall, Trondelag, Norway. March.

Mateusz Piesiak / Drone tracking shot of Whooper swan (Cygnus cygnus) flock flying above braided glacial river, Iceland. June.

Mateusz Piesiak / Drone tracking shot of Whooper swan (Cygnus cygnus) flock flying above braided glacial river, Iceland. June.

Mateusz Piesiak / Drone tracking shot of Whooper swan (Cygnus cygnus) flock flying above braided glacial river, Iceland. June.

Mateusz Piesiak / Drone tracking shot of Great cormorant (Phalacrocorax carbo) resting on edge of ice on glacial river, south Iceland. February.

Mateusz Piesiak / Aerial shot of Gull (Larus sp.) flock near braided glacial river, south Iceland. June.

Mateusz Piesiak / Aerial tracking shot of Gull (Larus sp.) flock near braided glacial river, south Iceland. June.

Franco Banfi / Cocoi heron (Ardea cocoi) fishing in river, Pantanal wetlands, Mato Grosso, Brazil.

Robin Chittenden / Mallard (Anas platyrhynchos) female with ducklings on water, Norfolk, England, UK. July.

Robin Chittenden / Mallard (Anas platyrhynchos) ducklings on water, Norfolk, England, UK. July.

Robin Chittenden / Lesser scaup (Aythya affinis) among group of Tufted ducks (Aythya fuligula) on water, Norfolk, England, UK. July.

Robin Chittenden / Great crested grebe (Podiceps cristatus) on water spreading its wings, Norfolk, England, UK. June.

Robin Chittenden / Three Little terns (Sterna albifrons) in flight over water, Winterton, Norfolk, England, UK. June.

Robin Chittenden / Four Shelducks (Tadorna tadorna) in flight, Norfolk, England, UK. June.

Robin Chittenden / Avocets (Recurvirostra avosetta) pair mating on water, Cley Marshes, Norfolk, England, UK. April.

Robin Chittenden / Two Shelduck (Tadorna tadorna) drakes chasing each other on water during territorial dispute, Norfolk, England, UK. June.

Robin Chittenden / Common gull (Larus canus) lying on its back with legs in the air, bathing in water, Norwich, Norfolk, England, UK. January.

Jussi Murtosaari / White-throated dipper (Cinclus cinclus) perched on rock in river, Finland, February.

Jussi Murtosaari / White-throated dipper (Cinclus cinclus) looking for food beneath surface of river, Finland, February.

Jussi Murtosaari / White-throated dipper (Cinclus cinclus) looking for food beneath surface of river, Finland, February.

Jussi Murtosaari / White-throated dipper (Cinclus cinclus) perched on rock beside river, Finland, October.

Jussi Murtosaari / White-throated dipper (Cinclus cinclus) perched on edge of small waterfall, Finland, October.

Jussi Murtosaari / Common ringed plover (Charadrius hiaticula) juvenile bathing, Finland, August.

Jussi Murtosaari / Common ringed plover (Charadrius hiaticula) juvenile bathing, Finland, August.

Jussi Murtosaari / Common ringed plover (Charadrius hiaticula) juvenile bathing, Finland, August.

Jussi Murtosaari / Common ringed plover (Charadrius hiaticula) juvenile bathing, Finland, August.

Jussi Murtosaari / Common kingfisher (Alcedo atthis) in flight over river with fish in beak, Finland, March.

Ugo Mellone / Brown pelican (Pelecanus occidentalis) standing on the shore with boats moored behind, Taganga beach, Caribbean Sea, Colombia.

Tom Vierus / Two White-faced herons (Egretta novaehollandiae) foraging on the foreshore at low tide with a large continer ship passing by in the distance, Suva, Central Division, Fiji, Pacific Ocean.

Robin Chittenden / Bittern (Botaurus stellaris) resting on dead vegetation in water, Norfolk, England, UK. February.

Grant Maslowski / Shore plover (Thinornis novaeseelandiae) leucistic male, standing on rocky shoreline, Rangatira Island, Chatham Islands, New Zealand. Endangered.

Grant Maslowski / Shore plover (Thinornis novaeseelandiae) leucistic male, feeding in a rockpool on a rocky shoreline, Rangatira Island, Chatham Islands, New Zealand. Endangered.

Grant Maslowski / Northern giant petrel (Macronectes halli) in flight with The Pyramid island in distance, Rangatira Island, Chatham Islands, New Zealand.

Grant Maslowski / Northern giant petrel (Macronectes halli) in flight with The Pyramid island in distance, Rangatira Island, Chatham Islands, New Zealand.

Grant Maslowski / Two Campbell Island teals (Anas nesiotis) feeding in coastal stream under moonlight, Sealers Bay, Whenua Hou / Codfish Island, New Zealand.

Grant Maslowski / Campbell Island teal (Anas nesiotis) feeding in coastal stream under moonlight, Sealers Bay, Whenua Hou / Codfish Island, New Zealand.

Grant Maslowski / Kea (Nestor notabilis) in flight over an alpine lake with Doubtful Sound in the background, Fiordland National Park, South Island, New Zealand. Endangered.

Grant Maslowski / View of Okarito Forest, habitat of the Okarito kiwi (Apteryx rowi), with the Southern Alps including Mt Cook and Mt Tasman in background. Shorebirds including Pied stilts (Himantopus leucocephalus) an...

Robin Chittenden / Bittern (Botaurus stellaris) standing among vegetation at water's edge at sunset, Norfolk, England, UK. March.

Robin Chittenden / Fulmar (Fulmarus glacialis) flock feeding on water surface, Iceland. June.

Robin Chittenden / Fulmar (Fulmarus glacialis) flock feeding on water surface, Iceland. June.

Robin Chittenden / Common kingfisher (Alcedo atthis) taking flight from water, Norfolk, England, UK. October.

Robin Chittenden / Knot (Calidris canutus) flock in flight over water, Norfolk, England, UK. February.

Robin Chittenden / Dipper (Cinclus cinclus) perched on rock in stream, Youlgreave Derbyshire, England, UK. July.

Robin Chittenden / RF - Bittern (Botaurus stellaris) standing among reeds at water's edge, Norfolk, England, UK. March. (This image may be licensed either as rights managed or royalty free.)

Robin Chittenden / RF - Fulmar (Fulmarus glacialis) flock feeding on sea surface, Iceland. June. (This image may be licensed either as rights managed or royalty free.)

Robin Chittenden / RF - Knot (Calidris canutus) flock in flight over water along the coast, Norfolk, England, UK.February. (This image may be licensed either as rights managed or royalty free.)

John Waters / Common starling (Sturnus vulgaris) flock landing beside reedbed and bathing in ice-free water, Ham Wall RSPB Reserve, Somerset, England, UK, December.

John Waters / Common starling (Sturnus vulgaris) flock settling in reedbed and bathing in ice free water prior to roosting, Ham Wall RSPB Reserve, Somerset, England, UK, December.

David Tipling / Golden plover (Pluvialis apricaria) flock standing in shallow water, Titchwell RSPB Reserve, Norfolk, England, UK. December.

David Tipling / Golden plover (Pluvialis apricaria) flock standing in shallow water, Titchwell RSPB Reserve, Norfolk, England, UK. December.

David Tipling / Golden plover (Pluvialis apricaria) flock standing in shallow water, Titchwell RSPB Reserve, Norfolk, England, UK. December.

David Tipling / Golden plover (Pluvialis apricaria) flock standing in shallow water, Titchwell RSPB Reserve, Norfolk, England, UK. December.

David Tipling / Bar-tailed godwit (Limosa lapponica) in flight over water, North Norfolk, England, UK. November.

David Tipling / Common guillemot (Uria aalge) on water, North Norfolk, England, UK. November.

David Tipling / Little egret (Egretta garzetta) in flight over water preparing to land, backlit in winter sunlight, North Norfolk, England, UK. November.

David Tipling / Turnstone (Arenaria interpres) flock flying along edge of surf, Blakeney Point, Norfolk, England, UK, North Sea. October.

David Tipling / Group of Common scoters (Melanitta nigra) on water off Cley, North Norfolk, England, UK, North Sea. October.

David Tipling / Common guillemot (Uria aalge) on water, North Norfolk, England, UK. October.

David Tipling / Blackcap (Sylvia atricapilla) bathing at woodland pool, Norfolk, England, UK. April.

David Tipling / Lesser black-backed gull (Larus fuscus) landing on water carrying stolen egg in beak, Cley Marshes, Norfolk, England, UK. April.

David Tipling / Lesser redpoll (Acanthis cabaret) drinking at woodland pool, Norfolk, England, UK. January.

David Tipling / Grey heron (Ardea cinerea) standing in water among reeds, Cley, Norfolk, England, UK. January.

David Tipling / Eurasian wigeon (Anas penelope) male in flight, Holkham, north Norfolk, England, UK. January.

David Tipling / Eurasian wigeon (Anas penelope) male in flight against blue sky, Holkham, north Norfolk, England, UK. January.

David Tipling / RF - Golden plover (Pluvialis apricaria) flock standing in shallow water, Titchwell RSPB Reserve, Norfolk, England, UK. December. (This image may be licensed either as rights managed or royalty free.)

Pete Oxford / Agami heron (Agamia agami) wading through shallow water with fish prey in beak, Pantanal, Brazil.

Pete Oxford / Agami heron (Agamia agami) wading in shallow water, Pantanal, Brazil.

Pete Oxford / Two Large-billed terns (Phaetusa simplex) standing at water's edge, one with fish prey in beak, Pantanal, Mato Grosso, Brazil.

Stefan Christmann / Emperor penguins (Aptenodytes forsteri) jumping out of the water onto sea ice with a tunnel of water trailing from its tail. This indicates that this bird has just released bubbles of air which were t...

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) standing at the edge of the sea ice calling, Atka Bay, Antarctica.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) swimming in the calm ocean, with an iceberg in background, Atka Bay Antarctica.

Richard Sidey / Two Adelie penguins (Pygoscelis adeliae) and a Gentoo penguin (Pygoscelis papua) standing next to a huge blue iceberg, Weddell Sea, Antarctica.

Richard Sidey / Adelie penguin (Pygoscelis adeliae) colony standing alongside a huge blue iceberg, Weddell Sea, Antarctica.

Richard Sidey / Aerial view of group of Adelie penguins (Pygoscelis adeliae) standing on a large iceberg and swimming in a turquoise pool, Weddell Sea, Antarctica.

Richard Sidey / Aerial view of group of Adelie penguins (Pygoscelis adeliae) standing on a large iceberg alongside a turquoise pool, Weddell Sea, Antarctica.

Richard Sidey / Aerial view of group of Adelie penguins (Pygoscelis adeliae) standing on a large iceberg alongside a turquoise pool, Weddell Sea, Antarctica.

Jack Perks / Northern gannets (Morus bassanus) diving into water, Noss, Shetland,Scotland, UK, North Sea, July.

Jack Perks / Common eider duck (Somateria mollissima) female preening whilst standing in sea on beach, Seahouses, Northumberland, England, UK, North Sea, April.

Jack Perks / Northern gannets (Morus bassanus) swimming on surface and diving beneath water, Noss, Shetland, Scotland, UK, North Sea, July.

Jack Perks / Common eider duck (Somateria mollissima) males displaying to female on beach, Seahouses, Northumberland, England, UK, April.

David Gallan / Superb lyrebird (Menura novaehollandiae) male bathing in dried up waterhole during drought, Tathra, New South Wales, Australia, December.

Jack Perks / Razorbill (Alca torda) perching beside sea and looking around, Farne Islands, Northumberland, England, UK, April. Another Razorbill's beakl enters frame from the bottom right.

Jack Perks / Common eider duck (Somateria mollissima) x Common mallard duck (Anas platyrhynchos) hybrid male drinking from stream on beach, Seahouses, Northumberland, England, UK, April.

Maxime Aliaga / Capybara (Hydrochoerus hydrochaeris) standing in water among wetland vegetation with Wattled jacana (Jacana jacana) perched on its back, Pantanal, Mato Grosso, Brazil.

Lucas Bustamante / Scarlet macaw (Ara macao), Orange-cheeked parrots (Pyrilia barrabandi) and Cobalt-winged parakeets (Brotogeris cyanoptera) drinking water at an Upper Amazon clay lick, Yasuni National Park, Orellana,...