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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 large roughtail stingray, Dasyatis centroura, lays on the seagrass-covered seafloor of Turneffe Atoll off the coast of Belize. This reef is part of the massive Mesoamerican Reef System in the Caribbean Sea, the second largest barrier reef on Earth.

A discarded plastic bag drifts underwater amid the remote, tropical islands of Raja Ampat, Indonesia. Plastics break into tiny pieces that eventually enter the food web.

A well-camouflaged reef stonefish, Synanceia verrucosa, waits to ambush prey in Raja Ampat, Indonesia.

Morning light shines on a beautiful limestone island in Raja Ampat, Indonesia. This region is known as the heart of the Coral Triangle due to its incredible marine biodiversity. It is a popular destination for scuba divers and snorkelers.

A banded sea krait, Laticauda colubrina, searches for prey on a coral reef in Raja Ampat, Indonesia. This tropical area is known for its extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

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

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 hawksbill sea turtle, Eretmochelys imbricata, lays on a beautiful 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 huge giant clam, Tridacna gigas, grows on a shallow coral reef amid the tropical islands of Raja Ampat, Indonesia.

A colorful soft coral adorns a giant clam, Tridacna sp., growing on a healthy reef in Raja Ampat, Indonesia.

A beautiful nudibranch, Chromodoris coi, crawls across the seafloor in Komodo National Park, Indonesia.

A spotted porcelain crab, Neopetrolisthes maculatus, snuggles into its host anemone in Komodo National Park, Indonesia.

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

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

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

Adelie penguin (Pygoscelis adeliae), leaping into the sea at Booth Island, Antarctica, Polar Regions

African (black) oystercatcher (Haematopus moquini), De Hoop nature reserve, Western Cape, South Africa, Africa

Adult female and male long-finned pilot whales (Globicephala melas), offshore near Doubtful Sound, South Island, New Zealand, Pacific

Long-beaked common dolphin (Delphinus capensis) leaping near White Island, North Island, New Zealand, Pacific

St. Gerasimos Church with blue dome at sunset, Firostefani, Santorini, Cyclades, Aegean Sea, Greek Islands, Greece, Europe

View of boats in the bay at Kalami with Corfu Town in background, Corfu, Ionian Sea, Greek Islands, Greece, Europe

View over the fishing harbour to the ramparts and medina, Essaouira, Atlantic coast, Morocco, North Africa, Africa

Rocky cliffs rising from the sea near Pollara on the island of Salina, The Aeolian Islands, UNESCO World Heritage Site, off Sicily, Messina Province, Italy, Mediterranean, Europe

Rain squall moves across the Atlantic Ocean offshore of Nags Head, North Carolina, United States of America, North America

The picturesque fishing village of Reine, Moskenesoy, Lofoten, Nordland, Norway, Scandinavia, Europe

View of Chrysi Ammoudia and mountainous background, Thassos, Aegean Sea, Greek Islands, Greece, Europe

View of woodland and Chrysi Ammoudia in background, Thassos, Aegean Sea, Greek Islands, Greece, Europe

View of Church of the Holy Apostles and Thassos Town in background, Thassos Town, Limenas, Thassos, Aegean Sea, Greek Islands, Greece, Europe

View of coastline near Church of the Holy Apostles in Thassos Town, Thassos, Aegean Sea, Greek Islands, Greece, Europe

Fishing boat moored off beach south of the city at sunset, Otres Beach, Sihanoukville, Cambodia, Indochina, Southeast Asia, Asia

Southern right whale (Eubalaena australis) adult female flukes-up to catch the wind in Puerto Pyramides, Argentina, South America

Southern right whale (Eubalaena australis) adult female flukes-up to catch the wind in Puerto Pyramides, Argentina, South America

Southern right whale (Eubalaena australis) adult female surfacing head on in Puerto Pyramides, Golfo Nuevo, Argentina, South America

Typical granite rock formations in turquoise sea off Cala Granara, Spargi Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

Long line fishing boat in Cross Sound with the Fairweather Mountain Range as backdrop, Southeast Alaska, United States of America, North America

A view of South Marble Island in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Northern (Steller) sea lions (Eumetopias jubatus) hauled out at South Marble Island in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Adult female sea otter (Enhydra lutris kenyoni) eating urchins she has gathered off the sea floor in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

Adult female sea otter (Enhydra lutris kenyoni) eating urchins she has gathered off the sea floor in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

A view of the commercial whale watching vessel operating in Johnstone Strait, British Columbia, Pacific Ocean, Canada, North America

View of boats and harbour in Thassos Town at dusk, Thassos, Aegean Sea, Greek Islands, Greece, Europe

View of boats and harbour in Thassos Town at dusk, Thassos, Aegean Sea, Greek Islands, Greece, Europe

View of woodland and village of Panagia nestled in the hillside, Makriammos, Thassos, Aegean Sea, Greek Islands, Greece, Europe

Sea front and beach of Mers-Les-Bains seen from Le Treport, Somme department, Picardie region, France, Europe

View of coastline and Golden Beach at Chrysi Ammoudia, Thassos, Aegean Sea, Greek Islands, Greece, Europe