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California sea lion (Zalophus californianus) biting swim fins underwater at Los Islotes (the islets) just outside of La Paz, Baja California Sur in the Gulf of California (Sea of Cortez), Mexico.

A very rare sighting of an adult blue Whale (Balaenoptera musculus) fluke-up dive off the northwestern side of Spitsbergen Island in the Svalbard Archipelago, Barents Sea, Norway

Curious Galapagos sea lions (Zalophus wollebaeki) underwater at the Guy Fawkes Islets near Santa Cruz Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean

An adult day or Cyanea octopus (Octopus cyanea) changing color and texture in the marine preserve at Honolua Bay on the northwest side of Maui, Hawaii, USA. Pacific Ocean

California sea lions sitting atop drift net deployed from large ship (Zalophus californianus). USA, Channel Islands, CA

Bat ray & bat stars on sandy bottom (Holorhinus californicus & Patiria miniata). USA, Channel Islands, CA. (rr)

Crabeater seals (Lobodon carcinophaga) swimming along or hauled out on fast ice floe in Bourgeois Fjord near the Antarctic Peninsula

Adult male walrus (Odobenus rosmarus rosmarus) hauled out on the beach at Poolepynten in Prins Karls Forland, Barents Sea, Norway

Excited whale watchers reach out to touch an adult California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon, Baja Peninsula, Baja California Sur, Mexico

Galapagos sea lion (Zalophus wollebaeki) pup playing with its own exhalation underwater at Champion Islet near Floreana Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean

Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Group, Ecuador. Pacific Ocean.

Adult Tufted Puffin (Fratercula cirrhata) near nesting site on South Marble Island in Glacier Bay National Park, Southeast Alaska, USA. Pacific Ocean.

An adult day or Cyanea octopus (Octopus cyanea) changing color and texture in the marine preserve at Honolua Bay on the northwest side of Maui, Hawaii, USA. Pacific Ocean

Adult green sea turtle (Chelonia mydas agassizii) underwater off the west side of Isabela Island in the waters surrounding the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Adult fin whale (Balaenoptera physalus) surfacing near Isla Carmen in the lower Gulf of California (Sea of Cortez), Mexico

CT with an eight-inch tooth from lower right mandible (jawbone) of an adult bull Sperm Whale (Physeter macrocephalus), Gulf of California (Sea of Cortez), Mexico

Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding in the Falkland Islands, South Atlantic Ocean

Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean

Rubbing the baleen plates of a curious California Gray Whale (Eschrichtius robustus) calf in San Ignacio Lagoon, Baja Peninsula, Baja California Sur, Mexico

Spine-cheek anemone fish (Premnas biaculeatus), nice red anemonefish with white stripes and prominant spine on cheek, Sipadan Island, Malaysia

Unidentified flatworm (Pseudoceros spp. ) very colourful with orange and indigo colours over indistinct seabed, Sipadan, Mabul, Malaysia

Burrowing Starfish (Astropecten irregularis), typical shape of five arms, pink in colour, on dark sand seabed, St Abbs, Scotland, UK North Sea

Enteromorpha (Enteromorpha intestinalis),one of the mmost common green seaweeds to be found in shallow rockpools which copes with high temperatures and changes in salinity, Eyemouth, Scotland, UK North Sea

(Chaetodon falculata), very nice profile of all fish and markings against indistinct background, Tahiti, French Polynesia

Eagle ray (Aetobatus narinari), swimming over candy saebed, Little Cayman Island, Cayman Islands, Caribbean

Cryptic teardrop crab (Pelia mutica), Nice red crab sitting on cream sea fan with black background, Honduras, Caribbean.

Colonising Anemone (Nemanthus annamensis). excellent side view of anemone with tentacles extended, pale colour with spotted column, Tahiti, French Polynesia.

Fire Coral (Millepora alcicornis) with Parrotfish teeth marks on fire coral, Cayman Islands, Caribbean

Common Starfish (Asterias rubens), two common starfish grazing on algae covered dark red rock, Eyemouth, Scotland, UK North Sea

Basket Star fish (Astrophyton muricatum) Deep red coloured adult on lighter seafan, Honduras, Caribbean.

Sally lightfoot crab (Percon gibbesi), on coral boulder with sea urchin spines behind, Cayman Brac, Cayman Islands, Caribbean.

Yellow Tube Sponge (Aplysina fistularis) large group of sponges looking towards surface, Little Cayman Island, Cayman Islands, Caribbean

Sperm Whale (Physeter macrocephalus) surfacing in the mid-riff Island area of the Gulf of California (Sea of Cortez), Sonora, Mexico

Fragile Brittlestar (Ophiothrix fragilis), detail of many individuals with arms raised on gravel seabed, St Abbs, Scotland, UK North Sea

Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador

A lone adult dwarf minke whale (Balaenoptera acutorostrata subspecies) surfacing in the tropical south Atlantic Ocean

Giant Goby (Gobius cobitus), diagonal profile of fish on sandy seabed, Maltese Islands, Mediterranean

Adult male walrus (Odobenus rosmarus rosmarus), Prins Karls Forland, Svalbard Archipelago, Barents Sea, Norway

Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean

Young Galapagos sea lion (Zalophus wollebaeki) catching and eventually eating a Sally Lightfoot crab (Grapsus grapsus) in the Galapagos Island Group, Ecuador. Pacific Ocean.

Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater near snorkeler in the Galapagos Island Group, Ecuador

An adult day or Cyanea octopus (Octopus cyanea) changing color and texture in the marine preserve at Honolua Bay on the northwest side of Maui, Hawaii, USA. Pacific Ocean

Adult gentoo penguins (Pygoscelis papua) swimming and on small growlers in Neko Harbour in Andvord Bay, Antarctica

Beached California Gray Whale (Eschrichtius robustus) calf stranded by gill net around flukes on Isla Tiburon in the Gulf of California (Sea of Cortez), Mexico.

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

Adult Antarctic Minke Whale (Balaenoptera bonaerensis), also known as the Southern Minke Whale, breaching near the Antarctic Peninsula

Adult Galapagos penguin (Spheniscus mendiculus) split view underwater in the Galapagos Island Group, Ecuador

Divers Lisa Trotter and Robert Alexander enter the water with a large, curious, female leopard seal (Hydrurga leptonyx) near Booth Island on the western side of the Antarctic Peninsula, Antarctica

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

Black Brittle Starfish (Ophiocomino nigra), single individual on pale coloured sand background, St Abbs, Scotland, UK North Sea