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A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions

A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions

Adult kelp gull (Larus dominicanus), nesting on lichen covered rocks on Half Moon Island in Antarctica, Southern Ocean, Polar Regions

Chinstrap penguin (Pygoscelis antarctica), at breeding colony at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

A dawn view of Boatswain Bird Island just off Ascension Island in the southern tropical Atlantic Ocean, South Atlantic Ocean

Adult brown Skua (Catharacta antarctica), in flight near the Antarctic peninsula in the Southern Ocean, Antarctica, Polar Regions

Female southern elephant seal (Mirounga leonina) with newborn pup on the beach in Stromness Bay, South Georgia Island

Bigeye Trevally (Caranx sexfasciatus), schooling in Cabo Pulmo National Marine Park, Baja California Sur, Mexico, North America

Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding Zodiacs on New Island in the Falkland Islands

Southern right whale (Eubalaena australis) adult surfacing near Puerto Pyramides, Peninsula Valdez, Argentina

An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Northern (Steller) sea lion (Eumetopias jubatus) close-up eating a halibut in Southeastern Alaska, United States of America

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

Adult humpback whale (Megaptera novaeangliae) breaching along the west side of Chatham Strait in Alaska, United States of America

Adult humpback whale (Megaptera novaeangliae) breaching along the west side of Chatham Strait in Alaska, United States of America

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

Adult humpback whale (Megaptera novaeangliae) tail throw among feeding whales in Southeast Alaska, United States of America

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) leaping in Johnstone Strait, British Columbia, Canada

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) leaping in Johnstone Strait, British Columbia, Canada

A pod of Pacific white-sided dolphins (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

A juvenile killer whale (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

A small pod of killer whales (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

Adult bearded seal (Erignathus barbatus) swimming amongst the ice in the Svalbard Archipelago, Norway

Adult black-legged kittiwakes (Rissa tridactyla) in flight in the Svalbard Archipelago, Barents Sea, Norway

Adult male hooded seal (Cystophora cristata) hauled out on pack-ice in seasof Denmark Strait, between Iceland and Greenland

Group of at least eight killer whales (Orcinus orca) surfacing off the coast of the island of Surtsey, southern Iceland

Harp seal (Pagophilus groenlandicus), hauled out on the pack-ice in between Iceland and Greenland in the Denmark Strait, Denmark

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

Small pod of eight to ten 'Type A' Oceanic killer whales (Orcinus orca), hunting near Stanley, Falkland Islands, South America

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

A rare melanistic king penguin (Aptenodytes patagonicus), feeding its okum boy chick at Fortuna Bay, South Georgia Island, Polar Regions

Adult crabeater seal (Lobodon carcinophaga), hauled out on iceberg at Booth Island near the Antarctic Peninsula, Polar Regions

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Suspected illegal fishing vessel with shark fins hanging up to dry on the aft deck, encountered near Saint Helena, South Atlantic Ocean

Adult California gray whales (Eschrictius robustus), spy-hopping in San Ignacio Lagoon, Baja California, Mexico, North America

Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island

Young adult bull southern elephant seal (Mirounga leonina) holding young pup's head underwater trying to kill it, South Georgia Island, Southern Ocean

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

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Adult sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern Alaska, United States of America

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

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

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

An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Galapagos sea lion mother nursing pup (Zalophus wollebaeki) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Snorkelers with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

A small pod of killer whales (Orcinus orca) off Ascension Island in the Tropical Atlantic Ocean, South Atlantic Ocean

Antarctic fur seal pup (Arctocephalus gazella) near the abandoned whaling station at Stromness Bay on South Georgia, Polar Regions

Antarctic fur seal pups (Arctocephalus gazella) playing in Fortuna Bay on South Georgia, Southern Ocean, Polar Regions

Adult imperial shag (Phalacrocorax (atriceps) atriceps) in flight in the Falkland Islands, South Atlantic Ocean, South America

Icebergs and sea ice in the Weddell Sea on the eastern side of the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

Reflections of icebergs in the calm water photographed from an expedition ship operating in Antarctica, Southern Ocean, Polar Regions

Juvenile Galapagos brown pelican (Pelecanus occidentalis urinator), smallest species of pelican worldwide, feeding in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Gentoo penguin (Pygoscelis papua) nesting colony at Jougla Point on Wiencke Island, Antarctica, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) at sunrise on South Georgia Island, Southern Ocean, Polar Regions

Young adult bull southern elephant seal (Mirounga leonina) holding young pup's head underwater trying to kill it, South Georgia Island, Southern Ocean

A long-beaked common dolphin pod (Delphinus capensis), traveling off Gorda Banks, Baja California Sur, Mexico, North America

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

A pod of Pacific white-sided dolphins (Lagenorhynchus obliquidens) leaping and surfacing in Johnstone Strait, British Columbia, Canada, North America

An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America

Horse-eye jacks (Caranx latus), schooling in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

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

Nurse shark (Ginglymostoma cirratum), with boat in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize