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Southern stingray (Hypanus americanus), with snorkeler in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Northern (Steller) sea lions, (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Alaska, United States of America

Northern (Steller) sea lions, (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Alaska, United States of America

Northern (Steller) sea lion (Eumetopias jubatus) fishing on the flood tide in Inian Pass, Southeastern Alaska, United States of America

Adult sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern Alaska, United States of America

Adult sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern Alaska, United States of America

Adult humpback whale (Megaptera novaeangliae) breaching along the west side of Chatham Strait in Alaska, United States of America

Adult humpback whale (Megaptera novaeangliae) breaching along the west side of Chatham Strait in Alaska, United States of America

Scenic view from Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America

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

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

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

Adult common (northern) minke whale (Balaenoptera acutorostrata) sub-surface feeding in the Svalbard Archipelago, Norway

Adult white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

Adult white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

A curious young polar bear (Ursus maritimus), approaches the ship on Spitsbergen in the Svalbard Archipelago, Norway

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

Adult humpback whale (Megaptera novaeangliae), surfacing near researchers in Zodiac at sunset, Iceland

Adult Munk's pygmy devil ray (Mobula munkiana), leaping into the air, Ensenada Grande, Isla Partida, Baja California Sur, Mexico, North America

Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America

Adult Atlantic walrus (Odobenus rosmarus), on the beach in Musk Ox Fjord, Ellesmere Island, Nunavut, Canada, North America

Crowds of Guillemots (Uria aalge), on Staple Island, in the Farne Islands, Northumberland, northeast England, United Kingdom, Europe

Chinstrap penguins (Pygoscelis antarcticus), on the beach at Coronation Island, South Orkney Islands, Antarctica, Polar Regions

Ecotype Big B killer whale (Orcinus orca), surfacing amongst ice floes in Lemaire Channel, Antarctica, Polar Regions

Adult Galapagos marine iguanas (Amblyrhynchus cristatus), on Fernandina Island, Galapagos, Ecuador, South America

Polar bear (Ursus maritimus), mother and two cubs on an ice floe in the fog in Davis Strait, Nunavut, Canada, North America

Penguins marching along a glacier face on Saunders Island, South Sandwich Islands, South Atlantic, Polar Regions

A pair of humpback whales (Megaptera novaeangliae), underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Humpback whale (Megaptera novaeangliae), mother and calf underwater, Ningaloo Reef, Western Australia, Australia, Pacific

An adult bluestreak goby (Valenciennea strigata), on the reef off Kri Island, Raja Ampat, Indonesia, Southeast Asia

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

Seabirds Tropicbirds, Pajaros Islet (Swan's Cay off the coast of Boca del Drago on Colon Island, Bocas del Toro Archipelago, Republic of Panama, Central America

Christmas tree worms (Spirobranchus giganteus), in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia

An adult northern giant petrel (Macronectes halli) in flight in the Drake Passage, Argentina, South America

A lone adult male killer whale (Orcinus orca) encountered in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, Pacific Ocean, North America

Soft leather corals grow in the shallow waters in the Solomon Islands, Melanesia. This region, in the eastern part of the Coral Triangle, harbors spectacular marine biodiversity and is known for its beautiful reefs.

Colorful gorgonians and reef-building corals grow in shallow water near the famous Blue Hole in Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

A beautiful nudibranch (Hypselodoris bullockii) crawls slowly across a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A beautiful set of tiny tunicates grows on a reef in Indonesia.This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Delicate corals grow on a shallow reef near the island of Flores in Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

Corals grow on a shallow reef in Indonesia. This beautiful, tropical region is known for its spectacular reefs and high marine biodiversity.

A hairy frogfish (Antennarius striatus) uses its incredible camouflage to successfully capture prey in Lembeh Strait, Indonesia.

A beautiful starfish (Linckia laevigata) lays on a thriving reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A rare roughsnout ghost pipefish (Solenostomus paegnius) hovers above the seafloor in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A snowflake moray eel (Echidna nebulosa) pokes its head out of a hole in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A lionfish (Pterois volitans) displays its venomous spines in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A spine-cheeked anemonefish (Premnas biaculeatus) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia.

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

Detail of the colorful dorsal fin of a scorpionfish (Scorpaenopsis sp.) in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A banded sea snake (Laticauda colubrina) swims at the surface in Wakatobi National Park, Indonesia. This is one of the most venomous snakes in the world.

A hawksbill sea turtle (Eretmochelys imbricata) is found on a reef at night in Komodo National Park, Indonesia.

Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A school of striped eel catfish (Plotosus lineatus) swarms over a reef searching for food in the Lesser Sunda Islands of Indonesia.

A white-spotted jellyfish (Phyllorhiza punctata) drifts in a strong current in the Lesser Sunda Islands of Indonesia.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim in a strong current near Alor in the Lesser Sunda Islands of Indonesia.

A colorful West Indian starfish, Oreaster reticulatus, crawls over a shallow, sandy seafloor in Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

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

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

A brightly colored soft coral adorns prop roots in a blue water mangrove forest in Raja Ampat, Indonesia.