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A Nile crocodile (Crocodylus niloticus) in water, Moremi Wildlife reserve, Okavango Delta, Botswana, Africa

American alligator (Alligator mississippiensis), Everglades, UNESCO World Heritage Site, Florida, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), Sorkapp, Svalbard Archipelago, Norway, Scandinavia, Europe

Durnstein and the Danube River, Wachau Cultural Landscape, UNESCO World Heritage Site, Austria, Europe

Long-beaked common dolphins (Delphinus capensis), Isla San Esteban, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

American alligator (Alligator mississippiensis), Everglades, UNESCO World Heritage Site, Florida, United States of America, North America

Waimea Falls, Waimea Valley Audubon Park, North Shore, Oahu, Hawaii, United States of America, Pacific

A shoal of tiny fish swimming over a coral reef in the Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

A shoal of small fish swimming over Acropora species hard corals, on a coral reef in Gaafu Dhaalu atoll, in the far south of the Maldives, Indian Ocean.

Swimming pool at Pestana Equador resort on the small Rolas (turtledove) island in the south of Sao Tome Island, Republic of Sao Tome and Principe,Africa

A Crocodilefish lies motionless on the sandy bottom at night in Papua New Guinea employing camouflauge while laying in wait for an unsuspecting fish.

A colourful fishing boat in the harbour in Loggos, Paxos, Ionian Islands, Greek Islands, Greece, Europe

Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Tourists swimming and snorkelling in the Xel-Ha Lagoon National Park, Yucatan Peninsula, Mexico, North America

Whale shark (Rhincodon typus), filter feeding underwater off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Adult humpback whale (Megaptera novaeangliae) feeding off the west coast of Spitsbergen, Svalbard, Arctic, Norway, Scandinavia, Europe

Curious young California sea lion (Zalophus californianus) with snorkeler underwater at Los Islotes, Baja California Sur, Mexico, North America

Short-finned pilot whale (Globicephala macrorhynchus) cow and calf surfacing off Isla San Marcos, Baja California, Mexico, North America

Grey seal (Halichoerus grypus) swimming, Farne Islands, Seahouses, Northumberland, England, United Kingdom, Europe

Natural swimming pool and beach near El Cotillo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Gentoo penguins (Pygocelis papua papua) getting out of the water, Sea Lion Island, Falkland Islands, South Atlantic, South America

Little boy snorkeling looking at the starfish in the lagoon, Ile aux Aigrettes, Pointe d'Esny, Mahebourg, Mauritius, Indian Ocean, Africa

Tropical fish under the waves along the tropical coral reef, Le Morne Brabant, Black River district, Mauritius, Indian Ocean, Africa

Tropical fish swimming on coral reef in the tropical lagoon, Le Morne Brabant, Black River district, Mauritius, Indian Ocean, Africa

An adult southern fulmar (Fulmarus glacialoides), feeding underwater on krill in Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions

Baby black-tip reef shark being surrounded by a school of silver sprats in a shallow lagoon, Maldives, Indian Ocean, Asia

Whale shark (Rhincodon typus,) filter feeding underwater off El Mogote, near La Paz, Baja California Sur, Mexico, North America

A curious male leopard seal (Hydrurga leptonyx), underwater at Monroe Island, South Orkney Islands, Antarctica, Polar Regions

Elevated view over Jolly Harbour and Jolly Beach, Antigua, Leeward Islands, West Indies, Caribbean, Central America

Elevated view over Jolly Harbour and Jolly Beach, Antigua, Leeward Islands, West Indies, Caribbean, Central America

Attractive woman in bikini, in crystal water of natural swimming pool at secret beach, Anse Marron, La Digue, Seychelles, Indian Ocean, Africa

Black caiman (Melanosuchus niger) swimming in the Madre de Dios River, Manu National Park, Peruvian Amazon, Peru, South America

Wood duck (Aix sponsa) hen and ducklings swimming, Arapahoe County, Colorado, United States of America, North America

Black caiman (Melanosuchus niger) swimming in the Madre de Dios River, Manu National Park, Peruvian Amazon, Peru, South America

Adult bigeye snapper (Lutjanus lutjanus) schooling off Port Airboret, Raja Ampat, Indonesia, Southeast Asia, Asia

Tufted Puffin (Fratercula cirrhata) with fish in its beak, Homer, Alaska, United States of America, North America

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

A lionfish (Pterois volitans) swims along the edge of a beautiful reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

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

A pink anemonefish (Amphiprion perideraion) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A colorful and healthy coral reef thrives in shallow water in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A broadclub cuttlefish (Sepia latimanus) uses camouflage to blend into a shallow coral reef in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.