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Juvenile alligator in swampland (bayou) at Jean Lafitte National Historical Park and Preserve, south of New Orleans, Louisiana, USA

Adult Peale's dolphin (Lagenorhynchus australis), underwater in shallow water near New Island, Falkland Islands, UK Overseas Protectorate, South America

Adult Commerson's dolphins (Cephalorhynchus commersonii), underwater at Carcass Island, Falkland Islands, UK Overseas Protectorate, South America

Adult Commerson's dolphin (Cephalorhynchus commersonii), underwater at Carcass Island, Falkland Islands, UK Overseas Protectorate, South America

Adult Peale's dolphin (Lagenorhynchus australis), underwater in shallow water near New Island, Falkland Islands, UK Overseas Protectorate, South America

Female scuba diver swimming underneath moored up dive boats, Sharm El Sheikh, Red Sea, Egypt, North Africa, Africa

Giant trevally (Caranx ignobilis) swimming above sea grass field, Naama Bay, Ras Mohammed National Park, Sharm El Sheikh, Red Sea, Egypt, North Africa, Africa

Silhouette of moored dive boats with scuba diver swimming underneath, underwater view, Red Sea, Egypt, North Africa, Africa

Close-up head on view of a hawksbill sea turtle (Eretmochelys imbricata), Bunaken National Park, Sulawesi, Indonesia, Southeast Asia, Asia

Humboldt (Jumbo) squid (Dosidicus gigas) swimming at night, Gulf of California, Baja California, Mexico, North America

Schooling Bigeye trevally (Caranx sexfasciatus) (jacks), Sipadan Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Diver swimming underwater along the wall at Sipadan Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Diver swimming underwater with Bigeye trevally (Caranx sexfasciatus) (jacks) at Sipadan Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Galapagos penguin (Spheniscus mendiculus) underwater at Isabela Island, Galapagos Islands, Ecuador, South America

Curious flightless cormorant (Phalacrocorax harrisi) underwater at Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Curious flightless cormorant (Phalacrocorax harrisi) underwater at Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Curious flightless cormorant (Phalacrocorax harrisi) underwater at Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Galapagos fur seal (Arctocephalus galapagoensis) underwater at Isabela Island, Galapagos Islands, Ecuador, South America

Adult green sea turtle (Chelonia mydas) feeding underwater near Isabela Island, Galapagos Islands, Ecuador, South America

Adult green sea turtle (Chelonia mydas) underwater near Rabida Island, Galapagos Islands, Ecuador, South America

Antarctic fur seal (Arctocephalus gazella) pup underwater in Stromness Bay, South Georgia, South Atlantic Ocean, Polar Regions

View showing the suckers on a day octopus (Octopus cyanea), Hawaii, United States of America, Pacific, North America

A nurse shark (Ginglymostoma cirratum) pictured with a school of juvenile jacks. Bahamas, Central America

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

The critically endangered hawksbill turtle (Eretmochelys imbricata) above coral reef, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Scuba diver swimming with Gopro in coral landscape scenic at Thetford Reef on the Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific

Adult Galapagos penguin (Spheniscus mendiculus) underwater, Bartolome Island, Galapagos Islands, Ecuador, South America

Flightless cormorant (Nannopterum harrisi) hunting underwater, Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Adult Galapagos penguin (Spheniscus mendiculus) underwater, Bartolome Island, Galapagos Islands, Ecuador, South America

Pink salmon (Oncorhynchus gorbuscha), spawning season, Prince William Sound, Alaska, United States of America, North America

Lion's mane jellyfish (Cyanea capillata), Prince William Sound, Alaska, United States of America, North America

Lion's mane jellyfish ((Cyanea capillata), Prince William Sound, Alaska, United States of America, North America

California gray whale calf (Eschritius robustus), half above half below, San Ignacio Lagoon, Baja California Sur, Mexico, North America

A pod of common bottlenose dolphins (Tursiops truncatus), underwater at El Mogote, Baja California Sur, Mexico, North America

California sea lion bulls (Zalophus californianus) underwater, Los Islotes, Baja California Sur, Mexico, North America

West Indian manatee (Trichechus manatus), half above and half below, Homosassa Springs, Florida, United States of America, North America

West Indian manatee (Trichechus manatus), half above and half below, Homosassa Springs, Florida, United States of America, North America

West Indian manatees (Trichechus manatus) underwater in Homosassa Springs, Florida, United States of America, North America

West Indian manatee (Trichechus manatus), half above and half below, Homosassa Springs, Florida, United States of America, North America

Adult whitetip reef shark (Triaenodon obesus) with cleaner wrasse, Roroia, Tuamotus, French Polynesia, South Pacific, Pacific

Schooling mullets off a tiny motu in the inner lagoon of Bora Bora, Society Islands, French Polynesia, South Pacific, Pacific

Blacktip reef sharks (Carcharhinus melanopterus) cruising the shallow waters of Moorea, Society Islands, French Polynesia, South Pacific, Pacific

Blacktip reef sharks (Carcharhinus melanopterus) cruising near tourists at Stingray City, Moorea, Society Islands, French Polynesia, South Pacific, Pacific

Blacktip reef sharks (Carcharhinus melanopterus) cruising the shallow waters of Moorea, Society Islands, French Polynesia, South Pacific, Pacific

Blacktip reef shark (Carcharhinus melanopterus) cruising the shallow waters of Moorea, Society Islands, French Polynesia, South Pacific, Pacific

Blacktip reef sharks (Carcharhinus melanopterus) cruising the shallow waters of Moorea, Society Islands, French Polynesia, South Pacific, Pacific

Whale shark (Rhincodon typus) with rainbow runner observed by a tourist and guide in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typu ) in Honda Bay, Puerto Princesa, Palawan, The Philippines, Southeast Asia, Asia

Whale shark (Rhincodon typus) below a banca boat in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Whale shark (Rhincodon typus) below a banca boat in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia