David Tipling / Grey seal (Halichoerus grypus) pup, Horsey, Norfolk, England, UK, February.

Theo Bosboom / Wave breaking in front of the two famous sea stacks Risin and Kellingin on the Faroe Islands. March 2018.

Jordi Chias / Antarctic fur seal (Arctocephalus gazella), Antarctic Peninsula, Antarctica.

SCOTLAND: The Big Picture / Cuckoo wrasse (Labrus bergylta) and Ballan wrasse (Labrus bergylta) on the wreck of Jayne, Shetland

David Pattyn / Humpback whale (Megaptera novaeangliae) breaching in front of a tourist boat, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

Nick Hawkins / Galapagos sea lion (Zalophus wollebaeki), three resting underneath school bus. Isabela Island, Galapagos. 2017.

David Fleetham / Bargibant's pygmy seahorse (Hippocampus bargibanti) wrapped around Eye fan coral (Cnidaria sp). Philippines.

David Fleetham / Smooth trunkfish (Lactophrys triqueter), portrait. Bonaire, Dutch Caribbean.

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

David Fleetham / Humpback whale (Megaptera novaeangliae), mother and calf swimming just below surface in front of the West Maui Mountains. South of Lahaina, West Maui, Hawaii.

David Fleetham / Whitetip reef shark (Triaenodon obesus) resting on sea floor. Kauai, Hawaii.

Tony Wu / Humpback whale (Megaptera novaeangliae australis) female, stationary with calf heading to surface for breath of air. Vava'u, Tonga, South Pacific.

David Fleetham / Hawaiian pom-pom / boxer crab (Lybia edmondsoni)with anemones (Triactis sp) that it carries around holding with the claws and using them for defense, waving in front of the possible aggressor. An exam...

Ingo Arndt / Reindeer (Rangifer tarandus) bull, Jason Harbour, South Georgia, February

Tony Wu / Humpback whale (Megaptera novaeangliae) adult female at rest. The tubercles on the whale's head are clearly visible, as are the barnacles (Coronula diadema), whale lice (Cyamus boopis), and hairs on t...

Eric Baccega / Polar bear (Ursus maritimus) swimming in front of an iceberg, Arctic Bay, Baffin Island, Nunavut, Canada, June.

Alex Mustard / Ribbon sweetlips (Plectorhinchus polytaenia) USAT Liberty Wreck, Tulamben, Bali, Indonesia. Java Sea

SCOTLAND: The Big Picture / Grey seal (Halichoerus grypus) swimming towards camera, Orkney, Scotland, UK, August.

Tony Wu / Humpback whale (Megaptera novaeangliae) male breaching in front of Hunga island in Vava'u, Tonga, South Pacific

Chris & Monique Fallows / Dusky dolphins (Lagenorhynchus obscurus) porpoising, Puerto Madryn, Peninsula Valdez, Argentina, December.

Chris & Monique Fallows / Long-beaked common dolphin (Delphinus capensis) breaching in front of large ship during sardine run, East London, South Africa, June.

David Pattyn / Gannet (Morus bassanus) coming in to land in the colony in evening light, Great Saltee, Saltee Islands, County Wexford, Republic of Ireland, June

Alex Mustard / Great hammerhead shark (Sphyrna mokarran) swimming over a sandy seabed, accompanied by Rainbow runners (Elagatis bipinnulata) South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream,...

Alex Mustard / Green sea turtle (Chelonia mydas) female resting on a coral reef. Rock Islands, Palau, Mirconesia. Tropical west Pacific Ocean

Alex Mustard / Red Irish lord (Hemilepidotus hemilepidotus) resting on a yellow sponge, in front of red soft coral (Eunephthya rubiformis). Browning Pass, Port Hardy, Vancouver Island, British Columbia. Canada. Nor...

Pete Oxford / Whale shark (Rhincodon typus) front view portrait, Cenderawasih Bay, West Papua. Indonesia.

Franco Banfi / Great white shark (Carcharodon carcharias) swimming in front of scuba diving cages, Guadalupe Island, Mexico, Pacific Ocean. September 2011.

Pedro Narra / Green Turtle (Chelonia mydas) returning to sea, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the Terre Sau...

Juergen Freund / Mud crab (Scylla serrata) in shallow sandy water. Split level with island and thatched house on stilts. Moromahu Island, Wakatobi, South Sulawesi, Indonesia. Second Place in the Portfolio Award of the...

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) cruising along the drop off of a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands. Caribbean Sea. NB. Turtle has two identification tags in its fron...

Solvin Zankl / Sargassumfish (Histrio histrio) swimming near Broad-toothed gulfweed (Sargassum fluitans) Sargassum Community. Sargasso Sea, Bermuda.

Solvin Zankl / Tiny crab on Broad-toothed Gulfweed (Sargassum fluitans) Sargassum Community. Sargasso Sea, Bermuda

Franco Banfi / Walrus (Odobenus rosmarus) two swimming underwater, Spitsbergen, Svalbard Archipelago, Norway, Arctic Ocean. July.

Franco Banfi / Walrus (Odobenus rosmarus) Spitsbergen, Svalbard Archipelago, Norway, Arctic Ocean. July.

Staffan Widstrand / Bearded seal (Erignathus barbatus) hauled out on ice, Spitsbergen, Svalbard, Norway, September.

Staffan Widstrand / Atlantic Walrus (Odobenus rosmarus) at surface, Svalbard, Norway, Arctic, September

Ole Jorgen Liodden / Bearded seal (Erignathus barbatus) hauled out on ice, Spitsbergen, Svalbard, Norway, July.

Juergen Freund / Green turtle (Chelonia mydas) hatchling swimming to the sea still in the shallows of the beach. Anano Island, Wakatobi, South Sulawesi, Indonesia

Erlend Haarberg / Rorbu houses in front of Festhelltinden mountain, Hamnoy, Moskenes, Lofoten, Norway, December.

Steven Kazlowski / Photographer in front of Northern lights / Aurora borealis glowing brightly over the frozen eastern Beaufort Sea, Arctic National Wildlife Refuge, Alaska Model released.

Steven Kazlowski / Polar bear (Ursus maritimus) curious young bear approaching camera, over newly forming pack ice during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) juvenile crossing over newly forming pack ice, during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) juvenile on beach, Galapagos

Christophe Courteau / Shore clingfish / Cornish sucker (Lepadogaster lepadogaster) portrait, Brittany, France, January.

Jordi Chias / Loggerhead turtle (Caretta caretta) close up, Los Gigantes, South Tenerife, Canary Islands, Atlantic

Jordi Chias / Loggerhead turtle (Caretta caretta) Los Gigantes, South Tenerife, Canary Islands, Atlantic

Pascal Kobeh / Aggregation of thousands of Spider crabs (Leptomithrax gaimardii) for moulting, South Australia Basin, Australia. Pacific Ocean.

Pascal Kobeh / Great white shark (Carcharodon carcharias) in open water, Guadalupe island, Mexico. Pacific Ocean.

Richard Robinson / Maui's dolphin (Cephalorhynchus hectori maui) Critically Endangered, the world's smallest and rarest marine dolphin. Endemic to North Island, New Zealand. October. Editorial use only.

Richard Robinson / Hector's dolphins (Cephalorhynchus hectori) Akaroa Harbour, South Island, New Zealand, November. Editorial use only.

Richard Robinson / Hector's dolphin (Cephalorhynchus hectori) Akaroa Harbour, South Island, New Zealand, November. Editorial use only.

Richard Robinson / Maui's dolphins (Cephalorhynchus hectori maui) Critically Endangered, the world's smallest and rarest marine dolphin. Endemic to North Island, New Zealand, March. Editorial use only.

Alex Mustard / Reticulate stargazer (Uranoscopus sp.) emerging from the sand. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of Red Sea anemonefish (Amphiprion bicinctus) against open water. Abu Nuhas, Strait of Subal, Egypt. Gulf of Suez, Red Sea.

Alex Mustard / Red Sea anemonefish (Amphiprion bicinctus) in front of magnificent sea anemone. Anemone City, Ras Mohammed Marine Park, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Alex Mustard / Vibrant Red Sea reef scene, with orange female Scalefin anthias (Pseudanthias squamipinnis) swarming in front of Fire coral (Millepora dichotoma) feeding on plankton brought to the reef by currents. R...

Alex Mustard / Portrait of male Scalefin anthias (Pseudanthias squamipinnis) swimming in open water, to feed on plankton. Ras Katy, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Jussi Murtosaari / Red Fox (Vulpes vulpes) swiming in sea, southwest Finland, February.

Chris & Monique Fallows / Common dolphin (Dephinus delphis) pod feeding on sardines (Sardinops oecllata) East London, South Africa.

Chris & Monique Fallows / African penguin (Spheniscus demersus) diving underwater, False Bay, Cape Town, South Africa.

Alex Mustard,Alex Mustard / A portrait of a Mediterranean anthias (Anthias anthias) against open water. Secca Del Papa, Tavolara Marine Protected Area, Sardinia, Italy. Mediterranean Sea.

Alex Mustard,Alex Mustard / A portrait of a nudibranch ( Limacia clavigera) searching for food on algae. Gulen, Norway. North East Atlantic Ocean.

Enrique Lopez-Tapia,Enrique Lopez-Tapia / Gentoo penguin (Pygoscelis papua) and Antarctic cruise liner 'MV Ushuaia' in Neko Harbour, Andvord Bay. Antarctic Peninsula, Antarctica

Alex Mustard,Alex Mustard / A portrait of a small Candy stripe shrimp (Lebbeus grandimanus) in front of its host pink anemone (out of focus because of the magnification). Browning Wall, Browning Pass, Port Hardy, Vancouver Islan...

Alex Mustard,Alex Mustard / A female (in front) and male Sockeye salmon (Oncorhynchus nerka) over eggs in their spawning river. Adams River, British Columbia, Canada, October.

Claudio Contreras / Osprey (Pandion haliaetus) with fish catch, Cabo Pulmo National Park, Sea of Cortez (Gulf of California), Mexico, July

Ben Cranke,Ben Cranke / Gentoo Penguin (Pygoscelis papua) coming in from the sea, Cuverville Island, Antarctic Peninsula, Antarctica

Franco Banfi / Two women snorkeling in front of the cave, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean. Model released.

Steven Kazlowski / Polar bear (Ursus maritimus) curious young male on the newly frozen pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) juvenile spreading body weight over thin newly forming pack ice, trying not to break through, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North...

Juergen Freund / Junior ranger carries a green turtle (Chelonia mydas) to shore for the scientific research data gathering. Queensland, Australia, May 2011. Model released.

Igor Shpilenok,Igor Shpilenok / A Kamchatka Brown Bear (Ursus arctos beringianus) standing in breaking waves. Pacific coast of Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, July.

Sue Daly,Sue Daly / Blue Maomao (Scorpis violaceus) shoal, Poor Knights Islands, New Zealand, February

Denis-Huot / Bottlenose dolphin (Tursiops truncatus) playing in the waves of an oil tanker, Port Aransas, Texas, USA

Franco Banfi / Southern right whale (Eubalaena australis) with calluses covered in parasitic crustaceans named cyamids or whale lice (Cyamus ovalis). Golfo Nuevo, Peninsula Valdes, UNESCO Natural World Heritage Site...

Doc White / Humpback Whale (Megaptera novaeangliae) female. Tonga, South Pacific, September.

Steven Kazlowski / Polar bear (Ursus maritimus) adult walking over newly formed pack ice during fall freeze up, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska, USA

Alex Mustard / Banded jawfish (Opistognathus macrognathus) male incubating eggs in mouth, which are at a late stage of development and will soon be ready for release. West Palm Beach, Gulf Stream, West Atlantic Ocea...

Alex Mustard / Grey angelfish (Pomacanthus arcuatus) portrait, Georgetown, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Bluestriped grunt (Haemulon sciurus) portrait, West End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Yellow goatfish (Mulloidichthys martinicus) swimming above the reef, West End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Inaki Relanzon / Australian Sea Lion (Neophoca cinerea) sitting on beach with one flipper up, Seal Bay Conservation Park, Kangaroo Island, South Australia State, Australia.

Pete Oxford / Black grouper (Mycteroperca bonaci) with mouth wide open, Jardines de la Reina National Park, Cuba, Caribbean

Pedro Narra / Bottlenose dolphin (Tursiops truncatus) leaping in front of a cargo ship, Sado Estuary, Portugal, September

Chadden Hunter / Emperor penguins (Aptenodytes forsteri) explode out of the water, returning to breed at Cape Washington, Antarctica. Taken on location for BBC Frozen Planet series, 2009

Chadden Hunter / Filming on the Antarctic sea-ice at the edge of a small hole. A cameraman gets a shock when a Killer whale (Orcinus orca) mother and calf explode out of the water in front of his face. Taken on locat...

Eric Baccega / Portrait of Harp seal (Phoca groenlandicus) pup on sea ice, Magdalen Islands, Gulf of St Lawrence, Quebec, Canada, March 2012

Andy Rouse / Male Walrus (Odobenbus rosmarus) in shallow water. Svalbard, Norway, August.

Ole Jorgen Liodden / Polar Bear (Ursus maritimus) with blooded face looking at Glaucous Gull (Larus hyperboreus) in flight. Spitsbergen, Svalbard, July.

Ole Jorgen Liodden / Walrus (Odobenus rosmarus) with waves splashing. Spitsbergen, Svalbard, August.

Nuno Sa / Blue Shark (Prionace glauca) near sea surface. Santa Maria, Azores, September.

Nuno Sa / Whale Shark (Rhincodon typus) accompanied by Pilot Fish (Naucrates ductor) and Remora. The biggest fish in the world has only started to visit the Azores in the past three years due to water temperatu...

Alex Mustard / 2020VISION / Pair of Common cuttlefish (Sepia officinalis), female in front of male, during spring spawning season, Babbacombe Bay, Torbay, Devon, UK, May

Steven Kazlowski / Polar bear (Ursus maritimus) curious cub sits up on its hind legs, paw raised, and tries to balance itself, along Bernard Spit in autumn, 1002 area of the Arctic National Wildlife Refuge, Alaska, US...

Steven Kazlowski / Walrus (Odobenus rosmarus) young bull underwater, along Spitsbergen and the northwest coast of the Svalbard Archipelago, Norway, Arctic Ocean, July

Andrew Parkinson / Puffins (Fratercula arctica) pair take off together to go fishing. Farne Islands, Northumberland, UK, May.