Nick Garbutt / Black-browed albatross (Thalassarche melanophris) flying over South Atlantic. Cooper Bay, South Georgia. November.

Doug Gimesy / Little blue penguin (Eudyptula minor), two standing on rocks at night, silhouetted against Melbourne city lights. St Kilda breakwater, Victoria, Australia. December 2016.

Doug Gimesy / Little penguin (Eudyptula minor) on rocks of St Kilda breakwater, Melbourne city lights in background. Victoria, Australia. January 2017.

Jordi Chias / Chinstrap penguin (Pygoscelis antarcticus) carcass after leopard seal attack, Antarctic Peninsula, Antarctica.

Jordi Chias / Wandering albatross (Diomedea exulans) flying on the open ocean, Drake passage, Antarctic Peninsula, Antarctica.

Jordi Chias / Gentoo penguins (Pygoscelis papua) swimming together in search of krill, Antarctic Peninsula, Antarctica.

Jordi Chias / Gentoo penguins (Pygoscelis papua) porpoising, swimming together in search of krill, Antarctic Peninsula, Antarctica.

Jordi Chias / Leopard seal (Hydrurga leptonyx) predating a Gentoo penguin (Pygoscelis papua) Antarctic Peninsula, Antarctica.

Jordi Chias / Gentoo penguin (Pygoscelis papua) with chick, Port Charcot, Antarctic Peninsula, Antarctica.Antarctic Peninsula, Antarctica.

John Shaw / Great frigatebird (Phaethon aethereus) male at nest site, with gular sac inflated to attract females. Genovesa Island, Galapagos, May.

John Shaw / Black-browed albatross pair (Thalassarche melanophris) mutual grooming during copulation. New Island, Falkland Islands, November.

Espen Bergersen / Humpback whale (Megaptera novaeangliae) diving. In background a diving boat and 3 divers visible in the water. Kvanangen, Troms, Norway. November

Espen Bergersen / Herring (Clupea harengus) caught in fishing net. Gulls in the net are taking of and flying around, shot with long shutter speed. Norway. December. November

Espen Bergersen / Killer whales / orcas (Orcinus orca). Spyhopping. Kvaloya, Troms, Norway November

Espen Bergersen / Gulls and Killer whales / orcas (Orcinus orca) feeding on herring. Kvaloya, Troms, Norway October

SCOTLAND: The Big Picture / Turnstones (Arenaria interpres) and Purple sandpipers (Calidris maritima) over wintering on the beaches of the Orkney Isles, Scotland, UK, April.

SCOTLAND: The Big Picture / Aerial view of nesting Gannets (Morus bassanus) and swirling seas, Hermaness, Shetland, Scotland, UK, October.

SCOTLAND: The Big Picture / Puffins (Fratercula arctica) Shaint Isles, Scotland, UK, June.

SCOTLAND: The Big Picture / Northern gannets (Morus bassanus) diving for fish, split level shot, Shetland, Scotland, UK, July.

SCOTLAND: The Big Picture / Northern gannets (Morus bassanus) diving for fish, split level shot, Shetland, Scotland, UK, September.

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) and Humpback whales (Megaptera novaeangliae) swimming around the boat and large numbers of...

Espen Bergersen / Aerial shot of a fishing boat catching Atlantic herring (Clupea harenguis), with Killer whales (Orcinus orca) and Humpback whales (Megaptera novaeangliae) swimming around the boats and large numbers o...

Marie Read / Horned Puffin (Fratercula corniculata) flying over a pattern of kelp and sea foam, photographed from above, St. Paul, Pribilof Islands, Alaska, USA. July.

Marie Read / Abstract patterns of reflected sky and clouds on the ocean with a silhouetted Red-faced cormorant (Phalarocorax urile) in flight, St. Paul Island, Pribilof Islands, Alaska, USA, July.

Marie Read / Great blue heron (Ardea herodias) in breeding plumage, head and shoulders showing plumes on crown and neck, Montezuma National Wildlife Refuge, New York, USA, May.

Alan Murphy/ BIA / Belted Kingfisher (Megaceryle alcyon) fishing, Texas

Juan Carlos Munoz / Griffon vulture (Gyps fulvus) landing on coast next to flock. Cantabria, Spain, March.

Alex Hyde / King penguins (Aptenodytes patagonicus). Grytviken, South Georgia. November.

Alex Hyde / Colonies of King penguins (Aptenodytes patagonicus) and Southern Elephant Seals (Mirounga leonina) on beach at St. Andrews Bay, South Georgia. November.

Alex Hyde / King penguins (Aptenodytes patagonicus) group of three on the shore, St. Andrews Bay, South Georgia. November.

Pal Hermansen / Avalanche on Gullemot (Uria aalge) nesting cliff on first day birds return to breed. Finnmark, Norway. March.

Tim Fitzharris / Atlantic Sailfish (Istiophorus albicans) and Magnificent Frigatebird (Fregata magnificens) flock hunting Round Sardinella (Sardinella aurita) school, Isla Mujeres, Mexico

Tui De Roy / Blue-footed booby (Sula nebouxii), group of eight diving into sea to fish. Punta Gavilanes, Fernandina Island, Galapagos.

Tui De Roy / Blue-footed booby (Sula nebouxii), group fishing underwater. Itabaca Channel, Santa Cruz Island, Galapagos.

Tui De Roy / Blue-footed booby (Sula nebouxii) diving towards sea, folding wings. Northeast coast, Santiago Island, Galapagos. Sequence 1/2.

Tui De Roy / Blue-footed booby (Sula nebouxii) landing. Punta Vicente Roca, Isabela Island, Galapagos.

Tui De Roy / Blue-footed booby (Sula nebouxii) coming in to land. Punta Vicente Roca, Isabela Island, Galapagos.

Tui De Roy / Blue-footed booby (Sula nebouxii) perched on rock at coast. Santa Fe Island, Galapagos. August 2015.

Tui De Roy / Blue-footed booby (Sula nebouxii), pair in courtship display. Punta Pitt, San Cristobal Island, Galapagos. April 2017.

Tui De Roy / Blue-footed booby (Sula nebouxii), five diving into sea. Espumilla Beach, Santiago Island, Galapagos.

Tui De Roy / Red-footed booby (Sula sula), pair nest building in tree. Darwin Bay, Genovesa Island, Galapagos.

David Tipling / Snow petrel (Pagadroma nivea nivea) flying around Iceberg off South Georgia, Southern Ocean January

David Tipling / Wandering albatross (Diomedea exulans) Southern Ocean near South Georgia, November

David Perpinan / Mallards (Anas platyrhynchos) paddling in river, seen from underwater, Scotland, UK, April.

Agustin Esmoris / Southern Right Whale (Eubalaena australis) surfacing with Kelp Gull (Larus dominicanus) picking off lice, Chubut, Argentina, sequence 1 of 4

Konrad Wothe / Pheasant (Phasianus colchicus) male calling, East Frisian Islands, Wittbulten National Park. Wadden Sea UNESCO World Heritage Site, Germany, June.

Dave Bevan / Grey plover (Pluvialis squatarola) eating a marine flatworm, Norfolk, England, UK, February.

Tui De Roy / Short tailed albatross (Phoebastria albatrus) subadult with fish-hook and monofilament line embedded in throat. Tsubamezaki, Torishima Island, Japan. December.

Tui De Roy / Short tailed albatross (Phoebastria albatrus) subadults courting, one with fish-hook and monofilament line embedded in throat. Tsubamezaki, Torishima Island, Japan. December.

Tui De Roy / Waved albatross (Phoebastria irrorata) on nest, with fish hook in throat, Punta Suarez, Espanola Island, Galapagos.

Philippe Clement / Common guillemots (Uria aalge) and Razorbills (Alca torda) swimming and fishing at sea, Fowlsheugh RSPB Reserve, Aberdeenshire, Scotland, UK, May.

Michel Roggo / View of African fish eagle (Haliaeetus vocifer),from underwater, trying to catch a fish on the surface, Okavango Delta, Botswana, June. Photographed for The Freshwater Project

Tui De Roy / Split level view of Brown pelicans (Pelecanus occidentalis) feeding, Tortuga Bay, Santa Cruz Island, Galapagos

Tui De Roy / Waved albatross (Phoebastria irrorata) group of three on nest, Punta Suarez, Espanola Island, Galapagos

Tui De Roy / Waved albatross (Phoebastria irrorata) pair in courtship display at nest site, Punta Suarez, Espanola Island, Galapagos

Tui De Roy / Swallow-tailed gull (Creagrus furcatus) Plazas Island, Galapagos

Guy Edwardes / Northern gannet (Morus bassanus), feeding frenzy, Noss NNR, Shetland, Scotland, UK

Tui De Roy / Atlantic yellow-nosed albatross (Thalassarche chlororhynchos) pair, Gough Island, Gough and Inaccessible Islands UNESCO World Heritage Site, South Atlantic. Endangered.

Tui De Roy / Atlantic yellow-nosed albatross (Thalassarche chlororhynchos) courtship display sequence. Gough Island, Gough and Inaccessible Islands UNESCO World Heritage Site, South Atlantic.

Tui De Roy / Atlantic yellow-nosed albatross (Thalassarche chlororhynchos). nesting amid Blechnum palmiforme tree ferns. Gough Island, Gough and Inaccessible Islands UNESCO World Heritage Site, South Atlantic.

Terry Whittaker / Slow motion close-up of a large group of Fulmars (Fulmarus glacialis) feeding from a fish processing plant outfall, Grundafjordur, Iceland, March.

Richard Robinson / Snares crested penguin (Eudyptes robustus) on rock washed with sea surf, Snares (Tine Heke) Sub Antarctic Island Group, Southern Ocean, New Zealand. December 2016. Editorial use only.

Fred Olivier / Adelie penguins (Pygoscelis adeliae) swimming underneath sea ice, Antarctica.

Claudio Contreras / Black-browed Albatross (Thalassarche melanophris) close up resting, West Point Island, Falkland Islands, October

Cyril Ruoso / Mute swan (Cygnus olor) feeding underwater, Burgundy, France, March.

Cyril Ruoso / Mute swan (Cygnus olor) feeding underwater, Burgundy, France, March.

Cyril Ruoso / Mute swan (Cygnus olor) feeding underwater, Burgundy, France, November.

Cyril Ruoso / Mute swan (Cygnus olor) feeding along riverbed, viewed underwater, Burgundy, France. November.

Cyril Ruoso / Mute swan (Cygnus olor) feeding along riverbed, viewed underwater, Burgundy, France. November.

Cyril Ruoso / Mute swan (Cygnus olor) feeding along riverbed, viewed underwater, Burgundy, France. November.

Fred Olivier / Large flock of Guanay cormorants (Phalacrocorax bougainvilli) flying to feed, Ballestas Islands, Peru.

Fred Olivier / Large flock of Guanay cormorants (Phalacrocorax bougainvilli) flying to feed, Ballestas Islands, Peru.

Fred Olivier / Wide angle shot of a large flock of Blue footed boobies (Sula nebouxii) taking off from the sea and diving on a bait ball, Isla Lobos de Terra, Peru.

Fred Olivier / Wide angle shot of a large flock of Blue footed boobies (Sula nebouxii) taking off from the sea and diving on a bait ball, Isla Lobos de Terra, Peru.

Peter Bassett / King penguins (Aptenodytes patagonicus) entering and leaving the sea near their breeding colony, Salisbury Plain, South Georgia.

Ingo Arndt / Double-crested cormorant (Phalacrocorax auritus) adult resting, close up portrait, Everglades National Park, Florida, USA. January. Finalist in the Birds Category of the GDT Awards 2015.

Tui De Roy / Snares Crested penguin (Eudyptes robustus) group walking up granite slope into Oleander forest, Station Point colony. Snares Island, New Zealand Sub-Antarctic Islands.

Tui De Roy / Brown pelican (Pelecanus occidentalis) diving in flight, Galapagos

Tui De Roy / Brown pelican (Pelecanus occidentalis) Galapagos

Tui De Roy / Waved albatross (Phoebastria irrorata) pair displaying on coast Galapagos, Ecuador. Critically Endangered species.

Tui De Roy / Waved albatross (Phoebastria irrorata) pair in courtship display, Galapagos, Ecuador. Critically Endangered species.

Tui De Roy / Nazca booby (Sula granti) portrait, Galapagos, Ecuador.

Fred Olivier / Emperor penguin (Aptenodytes forsteri) tobogganing on an iceberg at sunset and diving from the edge, seen from a moving boat, Antarctica.

Fred Olivier / Group of Adelie penguins (Pygoscelis adeliae) diving from the edge of the sea ice, Antarctica.

Fred Olivier / Adelie penguins (Pygoscelis adeliae) diving, seen from underwater, Antarctica.

Ingo Arndt / Fisheries Protection Vessel (Pharos) arrived at King Edward Point with King penguins on shoreline, South Georgia Heritage Trust Rat Eradication Project, South Georgia, February 2011

Sylvain Cordier / Emperor penguin (Aptenodytes forsteri), chick in brood pouch of parent, Snow Hill Island, Antarctic Peninsula

Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) pair gulp feeding and gulls hunting Northern Anchovy (Engraulis mordax), Monterey Bay, California

Pete Oxford / Flightless Cormorant (Phalacrocorax harrisi) foraging, Punta Moreno, Isabela Island, Galapagos Islands, Ecuador

Pete Oxford / Brown Pelican (Pelecanus occidentalis) on water, Urbina Bay, Isabela Island, Galapagos Islands, Ecuador

Gerrit Vyn / Black-faced Spoonbills (Platalea minor). Incheon, South Korea. October. Critically endangered.

Ann & Steve Toon / Arctic tern (Sterna paradisaea) with sandeel. Inner Farne, Northumberland, UK. July.

Alex Mustard / Brandt's cormorant (Phalacrocorax penicillatus) hunts for a meal in a school of Pacific chub mackerel (Scomber japonicus) beneath an oil rig. Eureka Rig, Los Angeles, California, USA, September

David Tipling / King penguins (Aptenodytes patagonicus) pair interacting, part of courtship, Gold Harbour South Georgia, January

David Tipling / Wandering albatross (Diomedea exulans) displaying to bird flying overhead on Albatross Island, South Georgia, January

David Tipling / Wandering albatross (Diomedea exulans) a pair displaying at dusk, Albatross Island, South Georgia January