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Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

Vibrant sea cucumbers, tunicates, hydroids, and other invertebrates cling to a reef in Raja Ampat, Indonesia.

Discarded plastic bags and other trash float above a shallow coral reef in Raja Ampat, Indonesia. Plastics have become a major pollution problem worldwide.

Healthy corals thrive along the edge of a mangrove forest in a remote part of Raja Ampat, Indonesia.

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.

Garden coral, sponges, and other invertebrates grow in a shallow seagrass meadow 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.

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.

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.

A magnificent sea anemone, Heteractis magnifica, grows on a reef 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.

A Wonderpus, Wunderpus photogenicus, hunts for prey on the sandy seafloor in Lembeh Strait, Indonesia.

A bleached magnificent sea anemone is found on a reef off the coast of Sulawesi in Indonesia. Bleaching is usually associated with higher than normal sea temperatures.

A school of blue-green damselfish, Chromis viridis, hovers amid the tropical islands of Raja Ampat, Indonesia.

A thick school of yellow-striped scad swims below a jetty amid the tropical islands of Raja Ampat, Indonesia.

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.

Several pink anemones cluster on top of a coral outcropping providing homes for several anemone fish, Maldives.

Southern giant petrel (Macronectes giganteus), feeding on a sheep carcass at West Point Island, Falkland Islands, South America

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

Waves crashing against the shore in Cross Sound, Southeast 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

View of Theologos village from elevated position, Theologos, Thassos, Aegean Sea, Greek Islands, Greece, Europe

Adult gentoo penguins (Pygoscelis papua), squabble at Booth Island, Antarctica, Southern Ocean, Polar Regions

Adult black-legged kittiwakes (Rissa tridactyla) resting on ice in the Svalbard Archipelago, Barents Sea, Norway, Arctic, Europe

Adult great skua (Stercorarius skua) with recent kill in the Svalbard Archipelago, Norway, Arctic, Europe

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult green sea turtle (Chelonia mydas agassizii) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Scene of the fish market in the port town of Puerto Ayora, Santa Cruz Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

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

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

Adult red-footed booby (Sula sula) returning to the nest site with nest building material in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

The white and black sand beach and estuary at Talisker with Preshal More beyond, both SSSI locations for the Tertiary basalt lava geology and biological habitats, Talisker Bay, Carbost, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

A myriad of hard and soft corals at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Fish trawler between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Adult yellow-lipped sea krait (Laticauda colubrina) snake, at night on the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

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

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

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

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

Young northern gannets (Morus bassanus) in flight near Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

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

King penguins (Aptenodytes patagonicus) on the beach at breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) on the beach at breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions

Adult grey-headed albatross (Thalassarche chrysostoma) (grey-headed mollymawk), Elsehul, South Georgia, Polar Regions

The Redwing on the beach at West Point Island in the Falkland Islands, South Atlantic Ocean, South America

Adult wandering albatross (Diomedea exulans) on the wing near the Antarctic Peninsula, Southern Ocean, Polar Regions

An adult bull among a pod of about 20 killer whales (Orcinus orca) in Antarctic Sound near the Antarctic Peninsula, Polar Regions

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) 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) pup in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

Galapagos sea lion (Zalophus wollebaeki) pup and curious bird, 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

Adelie penguin (Pygoscelis adeliae) on ice near Devil Island in the Weddell Sea near the Antarctic Peninsula, Antarctica, Polar Regions

Adelie penguins (Pygoscelis adeliae) in snowstorm at Brown Bluff on the Antarctic Peninsula in the Weddell Sea, Antarctica, Polar Regions

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

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

Female southern elephant seal (Mirounga leonina) with newborn pup as skuas (Catharacta antarctica) fight for the afterbirth, South Georgia

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

An adult red-footed booby (Sula sula), in its white color morph plumage in flight over the ocean in Palau, Micronesia, Pacific

A myriad of hard and soft corals compete for space on the substrate of Darwin's Wall, Palau, Micronesia, Pacific

Atlantic Puffin (Fratercula arctica), on Skomer Island in July, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe