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Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

Clymene dolphin (Stenella clymene) breaking the surface, showing characteristic markings on face and flanks, Senegal, West Africa, Africa

Black-browed albatross (Thalassarche melanophris) in flight low over the sea, showing full span of under wing, South Georgia, Polar Regions

An adult spinner dolphin (Stenella longirostris), leaping in the waters off the Kalpitiya Peninsula, Sri Lanka, Asia

California sea lion (Zalophus californianus), with fishing net around its neck, Isla San Pedro Martir, Baja California, Mexico, North America

Gentoo penguin (Pygoscelis papua papua) sitting on egg, Sea Lion Island, Falkland Islands, South America

Indo-Pacific bottlenose dolphin (Tursiops aduncus) socializing and feeding at night in Yampi Bay, Kimberley, Western Australia, Australia, Pacific

South American sea lions (Otaria flavescens) on rocks, Ballestas islands, Paracas, Peru, South America

Pacific green sea turtles (Chelonia mydas) underwater on Fernandina Island, Galapagos, Ecuador, South America

An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki), pup in Puerto Egas, Santiago Island, Galapagos, Ecuador, South America

Humpback whale (Megaptera novaeangliae), adult underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Transient killer whale (Orcinus orca) breaching in the Monterey Bay National Marine Sanctuary, California, United States of America, North America

Short-finned pilot whale (Globicephala macrorhynchus), underwater off Isla San Marcos, Baja California Sur, Mexico, North America

Short-finned pilot whale (Globicephala macrorhynchus), underwater off Isla San Marcos, Baja California Sur, Mexico, North America

Curious California sea lions (Zalophus californianus), underwater at Los Islotes, Baja California Sur, Mexico, North America

Southern elephant seal bull (Mirounga leoninar), sounding a challenge on the beach at Gold Harbor, South Georgia, Polar Regions

Southern Rockhopper penguin rookery (Eudyptes chrysocome), New Island, Falkland Islands, British Overseas Territory, South America

Adult bottlenose dolphins (Tursiops truncatus), flukes-up diving in Bahia Magdalena, Baja California Sur, Mexico, North America

Whale watcher with California gray whale (Eschrichtius robustus), San Ignacio Lagoon, Baja California Sur, Mexico, North America

Juvenile yellow-footed gull (Larus livens), eating a goatfish, Isla San Ildefonso, Baja California, Mexico, North America

A young whale shark (Rhincodon typus), near kayaker in Bahia Coyote, Conception Bay, Baja California Sur, Mexico, North America

An adult crabeater seal (Lobodon carcinophaga), hauled out on the ice in Antarctic Sound, Weddell Sea, Antarctica, Polar Regions

An adult crabeater seal (Lobodon carcinophaga), hauled out on the ice in Antarctic Sound, Weddell Sea, Antarctica, Polar Regions

Adult male Galapagos marine iguana (Amblyrhynchus cristatus), underwater, Fernandina Island, Galapagos, Ecuador, South America

Adult fin whale (Balaenoptera physalus), feeding on krill near Coronation Island, South Orkney Islands, Antarctica, Polar Regions

Curious type B2 killer whales (Orcinus orca), mother and calf inspecting the ship in the Errera Channel, Antarctica, Polar Regions

A leucistic Antarctic fur seal (Arctocephalus gazella), pup playing with normal pup in Grytviken, South Georgia, South Atlantic, Polar Regions

Chinstrap penguins (Pygoscelis antarcticus), and Adelie penguins on Saunders Island, South Sandwich Islands, South Atlantic, Polar Regions

Gentoo penguin (Pygoscelis papua), adults coming back from feeding at sea on the beach at New Island, Falklands, South America

Humpback whale (Megaptera novaeangliae), adult breaching on Ningaloo Reef, Western Australia, Australia, Pacific

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

An adult wandering albatrosss (Diomedea exulans) in flight in the Drake Passage, Argentina, South America

Hawaiian Sea Turtle (Green Sea Turtle) rests on the shore in Laniakea Beach (Turtle Beach) on Oahu island, Hawaii, United States of America, Pacific, North America

Adult humpback whale (Megaptera novaeangliae), breaching in Sitka Sound, Southeast Alaska, United States of America, North America

California sea lions (Zalophus californianus) underwater at Los Islotes, Baja California Sur, Mexico, North America

Adult Adelie penguins (Pygoscelis adeliae) walking on first year sea ice in Active Sound, Weddell Sea, Antarctica, Polar Regionswhitening of whites, slight increase in contrast

Common seals, harbour seals, hauled out on rocks, turquoise sea, Scousburgh Sands, South Mainland, Shetland Isles, Scotland, United Kingdom, Europe

View of seagull from ferry at sunset, Kavala, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Greece, Europe

Imperial shag (Leucocarbo atriceps) in flight carrying nesting material, Sea Lion Island, Falkland Islands, South America

A small pod of pack Ice type B killer whales (Orcinus orca), just after making a Weddell seal kill in the Lemaire Channel, Antarctica, Polar Regions

A school of big-eye jacks (Caranx sexfasciatus) above a coral reef in the Solomon Islands. This region is known for its healthy fish populations.

Detail of anchor coral tentacles (Euphyllia sp.) growing on a reef in Indonesia. This area is known for its high marine biodiversity.

A thorny seahorse (Hippocampus histrix) uses effective camouflage to blend into its surroundings on the seafloor of Lembeh Strait, Indonesia.

A tube anemone grows on a sandy seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A massive school of bigeye trevally (Caranx sexfasciatus) swims in deep water near Cocos Island, Costa Rica. This remote island is home to an incredible variety of marine life.

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

Detail of a colorful giant clam (Tridacna squamosa) growing on a reef near Alor in the Lesser Sunda Islands of Indonesia. This remote tropical region is home to extraordinary marine biodiversity. near Alor in the Lesser Sunda Islands of Indonesia.

A white-spotted jellyfish (Phyllorhiza punctata) drifts in a strong current in the Lesser Sunda Islands of Indonesia.

A white-spotted jellyfish (Phyllorhiza punctata) drifts in a strong current in the Lesser Sunda Islands of Indonesia.

A well-camouflaged yellow stingray, Urobatis jamaicensis, swims over a shallow seagrass meadow growing within Turneffe Atoll's lagoon in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth

A beautiful coral reef thrives in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

Adult black-browed albatross (Thalassarche melanophrys), in flight returning to nesting site on West Point Island, Falklands, South America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

Adult king penguins (Aptenodytes patagonicus) returning from sea to the nesting colony at Salisbury Plain, South Georgia, Polar Regions

Macaroni penguins (Eudyptes chrysolophus) scrambling up steep cliffs at Hercules Bay on South Georgia Island, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) mating in the surf at Gold Harbour on South Georgia Island, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) issuing a bellowing challenge at Gold Harbour on South Georgia, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

View of woodland and coastline near Chrysi Ammoudia, Thassos, Aegean Sea, Greek Islands, Greece, Europe

Southern right whale (Eubalaena australis) flukes-up dive near whale watching boat in Puerto Pyramides, Argentina, South America

Southern right whale (Eubalaena australis) adult female lifting both her head and flukes out of the water, Argentina, South America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Snow Pass, Alaska, United States of America, North America

Northern (Steller) sea lions (Eumetopias jubatus) hauled out on the WN buoy just outside Petersburg, Alaska, United States of America, North America

Adult sea otter (Enhydra lutris kenyoni) mother with her pup on her chest in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

Adult sea otter (Enhydra lutris kenyoni) mother with her pup on her chest in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

A rare sighting of an adult female sea otter (Enhydra lutris kenyoni) hauled out on land in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

Northern (Steller) sea lion (Eumetopias jubatus) bull feeding on fisherman's scraps near Petersburg, Alaska, United States of America, North America

Cliffs at Veules-les-Roses, Vaucottes hanging valley, Seine-Maritime department, Normandy region, France, Europe

Aval cliff and Needle, Etretat, Cote d'Albatre, Pays de Caux, Seine-Maritime department, Upper Normandy region, France, Europe

View of Livadi Beach from Viewpoint Archangel Michael, Thasos, Thassos, Aegean Sea, Greek Islands, Greece, Europe

Icebergs near the Antarctic Peninsula during the summer months, Antarctica, Southern Ocean, Polar Regions

Adult gentoo penguins (Pygoscelis papua), returning and coming from the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

Adult Dall's porpoise (Phocoenoides dalli) surfacing with characteristic rooster tail splash in Johnstone Strait, British Columbia, Canada, North America

A pod of killer whales (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

A young killer whale (Orcinus orca) surfacing in Glacier Bay National Park, Southeast Alaska, United States of America, Pacific Ocean, North America