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Clownfish (Amphiprion species) guarding their sea anemone home; on a coral reef in Gaafu Dhaalu atoll, Maldives

A Crown-of-Thorns starfish (Acanthaster planci) on a badly damaged section of a coral reef in Gaaful Dhaalu atoll, in the faer south of the Maldives.

A mixture of Acropora species scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A Ctenocella species octocoral sea fan, surrounded by an assortment of hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A huge Echinogorgia species sea fan, more than two metres across, on a coral reef in Gaafu Dhaalu atoll, Maldives

A growth of Acropora species, and one Goniastrea species (centre) scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

Mushroon Leather Coral (Sarcophyton species), a soft coral, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A 'forest' of Staghorn (Acropora species) hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A 'forest' of Staghorn (Acropora species) hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mixture of Acropora species scleractinic hard corals, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

Acropora species scleractinic hard corals, showing some bleaching, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mix of hard corals, with a Pocillopora species coral in the centre, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, Maldives

Heteractis species sea anemone guarded by Clownfish (Amphiprion species) on a coral reef in Gaafu Dhaalu atoll, Maldives

A shoal of small fish swimming over Acropora species hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A mix of Acropora species scleractinic hard corals growing on a coral reef in Gaafu Dhaalu atoll, Maldives

Golden Coastal Grass Sloping Toward Turquoise Sea with the Seaward Kaikoura Range in the Background, Kaikoura Peninsula, New Zealand

Point Kean Viewpoint. View of Rugged White Limestone Cliffs and Blue Sea at Kaikoura Peninsula, New Zealand

New Zealand Fur Seal Stretching on White Rock Surface Under Blue Sky at Kaikoura Peninsula, New Zealand

Green Sea Turtle (Chelonia mydas) nesting site at night on Long Beach on Ascension Island, Tropical Atlantic Ocean, South Atlantic Ocean

Flying fish from the family Exocoetidae take flight as the ship flushes them just off Ascension Island in the southern tropical Atlantic Ocean, South Atlantic Ocean

Flying fish from the family Exocoetidae take flight as the ship flushes them just off Ascension Island in the southern tropical Atlantic Ocean, South Atlantic Ocean

Leucistic caused by lack of melanin, or blond Antarctic fur seal pup (Arctocephalus gazella) on South Georgia, Polar Regions

Adult fin whale (Balaenoptera physalus) surfacing in the rich waters off the continental shelf near South Georgia, Polar Regions

Views of the abandoned whaling station at Grytviken, Swedish for Pot Cove, on South Georgia in the South Atlantic, Polar Regions

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

Tidal rocky flats and calm sea with distant mountains at Kaikoura Peninsula, South Island, New Zealand

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Adult male Antarctic fur seal (Arctocephalus gazella) hauled out on ice near Brown Bluff, Antarctica, Polar Regions

Adult Weddell seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, Southern Ocean, Polar Regions

Crabeater seals (Lobodon carcinophaga) hauled out on ice floe near the Antarctic Peninsula, Antarctica, Polar Regions

Humpback whale (Megaptera novaeangliae) flukes-up dive in the Weddell Sea near the Antarctic Peninsula, Antarctica, Polar Regions

Aerial view of tourist admiring the colorful starfish snorkeling in the turquoise lagoon, Zanzibar, Tanzania, East Africa, Africa

A cottage on the coast of Pingtan Island with windmills in the sea, Fuzhou City, Fujian Province, China

An argonaut (Genus Argonauta), a group of pelagic octopuses. Baja California, Sea of Cortez, Mexico, North America

Adult fin whale (Balaenoptera physalus), dorsal fin detail surfacing off Newport Beach, California, United States of America, North America

By-the-wind sailors (Velella velella), floating by the hundreds on the surface of the sea outside Newport Beach, California, United States of America, North America

California sea lions relaxing at Pier 39, San Francisco, San Francisco Peninsula, California, United States of America, North America

Moon jellyfish (Aurelia aurita), Aquarium of San Sebastian, Bay of Biscay, province of Gipuzkoa, Basque Country, Spain, Europe

Sally lightfoot crab (Grapsus grapsus) in the littoral of the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Sally lightfoot crab (Grapsus grapsus) in the littoral of the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

A small pod of killer whales (Orcinus orca) off the west coast of Isabela Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Guest from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Sally lightfoot crab (Grapsus grapsus) in the littoral of the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Sally lightfoot crab (Grapsus grapsus) in the littoral of the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Baleen whale skeleton, most likely a young Bryde's whale, on lava flow in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

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

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

Adult female leopard seal (Hydrurga leptonyx) hauled out on an ice floe in Kayak Cove on Brabant Island, Antarctica, Polar Regions

Antarctic fur seal pup (Arctocephalus gazella) caught in fishing net on South Georgia, Southern Ocean, Polar Regions

King penguin (Aptenodytes patagonicus) breeding and nesting colony on South Georgia Island, Southern Ocean, Polar Regions