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The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding on algae at low tide in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

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

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

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

Dead and dying pink salmon (Oncorhynchus gorbuscha) gathering after the spawn just outside of Sitka, Alaska, United States of America

A small red starfish clings to coralline algae in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

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

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

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Adult brown bear (Ursus arctos) feeding on humpback whale carcass in Glacier Bay National Park, Alaska, United States of America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding underwater in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

The Lindblad Expedition ship National Geographic Explorer in the Svalbard Archipelago, Norway, Arctic, Europe

Adult male Galapagos marine iguana (Amblyrhynchus cristatus), underwater, Fernandina Island, Galapagos, Ecuador, South America

Adult male Galapagos marine iguana (Amblyrhynchus cristatus), underwater, Fernandina Island, Galapagos, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

Chinstrap penguin (Pygoscelis antarctica) on rock with green algae, Hannah Point, Antarctica, Southern Ocean.

Soft leather coral, Sarcophyton sp., bleaching. This soft coral has lost its symbiotic algae, zooxanthellae, and turned white due to high water temperatures. Buyat Bay, North Sulawesi, Indonesia, Pacific Ocean.

Jourdan's turban (turbo jourdani) large gastropod shell, reddish-brown, Rottnest Island reef, wild, day, marine protected area, free-diving off, cool temperate waters of Western Australia. MORE INFO: Marine plant common kelp, a dominant feature of the underwater landscape. Protected areas are covered in lush growth of diverse algae, also red algea are here.

footballer sweep (neatypus obliquus) diagonal yellow bands are edged in black and stand out against the silvery-blue body, wild, day, marine protected area, reef, in small schools diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name stripey, eating green algae as they sweep over the reef.

Arc-eye hawkfish (Paracirrhites arcatus) perched on algae (Microdyction sp.), Ailuk atoll, Marshall Islands, Pacific

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding underwater in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding on fish at the Puerto Ayora fish market on Santa Cruz Island in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) foraging for algae underwater in the Galapagos Island Archipeligo, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) foraging for algae underwater in the Galapagos Island Archipeligo, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

Short-tailed pipefish, Trachyrhamphus bicoarctatus, fluorescing. A pipefish is covered by algae which is fluorescing under blue light. Buyat Bay, North Sulawesi, Indonesia, Pacific Ocean.

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

Brown chromis (Chromis multilineata) swimming over algae, Ressurreta, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) foraging for algae underwater in the Galapagos Island Archipeligo, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) foraging for algae underwater in the Galapagos Island Archipeligo, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) foraging for algae underwater in the Galapagos Island Archipeligo, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

Brown algae, Sargassum horneri and Undaria pinnatifida, Chusan, Ulleungdo, South Korea (East Sea or Sea of Japan).

French angelfish, Pomacanthus paru, Ilha rata, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil (S. Atlantic)

Neptune's necklace (Hormosira banksii), mangrove swamp, Opua, Bay of Islands, North Island, New Zealand

Scuba diver watching Giant starfish (Linckia columbia) on rock overgrown with algae, Cabo Marshall, Galapagos archipelago, Unesco World Nature Preserve, Ecuador, South America, Pacific

Evening mood at Skagsanden, beach near Flakstad, Flakstadsoya, Lofoten Islands, Nordland, Norway, Europe

Evening mood at Skagsanden, beach near Flakstad, Flakstadsoya, Lofoten Islands, Nordland, Norway, Europe

Evening mood at Skagsanden, beach near Flakstad, Flakstadsoya, Lofoten Islands, Nordland, Norway, Europe

Giant starfish (Linckia columbia) on rock overgrown with algae, Cabo Marshall, Galapagos archipelago, Unesco World Nature Preserve, Ecuador, South America, Pacific

Isle of Lewis, part of the island Lewis and Harris in the Outer Hebrides of Scotland. Coast at the Eye Peninsula. Europe, Scotland, July

Jennifer Carroll, oyster hatchery manager and researcher at Center of Marine Biotechnology, Baltimore MD.She is holding a diploid Asian oyster C. ariakensis in the "algae kitchen" in the biosecure laboratory. She is studying reproduction to determine whether to introduce into the bay.

A wet bald eagle (Haliaeetus leucocephalus) sits perched on a nest in grass atop an island at low tide, exposing rock and orange, yellow seaweed on a cloudy day in Prince William Sound, Alaska, United States of America

Close-up portrait of an oystercatcher bird (Haematopus) standing on a rock covered in yellow, orange colored seaweed, on a summer day in Prince William Sound, Alaska, United States of America

Harbor seal (Phoca vitulina) just above tideline lying down on a bed of yellow, orange seaweed in the sun, on a summer day in Prince William Sound, Alaska, United States of America

Mouth detail of a colorful and healthy mushroom coral (Fungia fungites) that is growing on a tropical coral reef. Mushroom coral is unique in the coral world, in that it does not attach itself to the bottom, Philippines

Mouth detail of a colourful and healthy Mushroom coral, Fungia fungites, that is growing on a tropical coral reef in the Philippines. Mushroom coral is unique in the coral world, in that it does not attach itself to the bottom, Philippines

Research divers from the MOC Marine Institute glue broken coral heads back together and map out coral damage at Molokini Marine Preserve off the island of Maui, Hawaii. In the future, data from here will help to determine the health of Hawaii's reefs, Maui, Hawaii, United States of America

Research divers from the MOC Marine Institute map out coral damage at Molokini Marine Preserve off the island of Maui, Hawaii. In the future, data from here will help to determine the health of Hawaii's reefs, Maui, Hawaii, United States of America

A research diver from the MOC Marine Institute glues broken coral back together at Molokini Marine Preserve off the island of Maui, Hawaii. The coral is tagged and will be monitored, Maui, Hawaii, United States of America

California, Giant kelp frond showing pneumatocysts (Macrocystis pyrifera) Catalina Island, Channel Islands National Marine Sanctuary.

Florida manatee Small fish pick algae of an endangered Florida Manatee Trichechus manatus latirostris at Three Sisters Spring in Crystal River Florida USA The Florida Manatee is a subspecies of the West Indian Manatee

Green sea turtle (Chelonia mydas) in seagrass - seagrass, sebadal, seba (Cymodocea nodosa). Of all the sea turtles that exist, it is the only omnivorous species, feeding in its subadult and adult state on marine plants and algae. Underwater bottoms of the Canary Islands, Tenerife.

Green sea turtle (Chelonia mydas) in seagrass - seagrass, sebadal, seba (Cymodocea nodosa). Of all the sea turtles that exist, it is the only omnivorous species, feeding in its subadult and adult state on marine plants and algae. Underwater bottoms of the Canary Islands, Tenerife.