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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

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

Humpback whale (Megaptera novaeangliae), underwater, Hawaii, United States of America, Pacific, North America

Humpback whale (Megaptera novaeangliae), underwater, Hawaii, United States of America, Pacific, North America

Close-up view of the underside of a Hawksbill sea turtle, complete with barnacles, on a reef in Raja Ampat, West Papua, 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 with Bigeye trevally (Caranx sexfasciatus) (jacks) at Sipadan Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

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

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

Schooling threadfin butterflyfish (Chaetodon auriga), in Rarotonga Lagoon, The Cook Islands, South Pacific, Pacific

A pair of Atlantic bottlenose dolphins (Tursiops truncatus), in the Bahama Banks, Bahamas, Central America

Atlantic bottlenose dolphin (Tursiops truncatus), Curacao, Netherlands Antilles, Caribbean, Central America

A mother and juvenile Atlantic Bottlenose Dolphin (Tursiops truncatus), in the Bahama Banks, Bahamas, Central America

The spotted porcupinefish (Diodon hystrix), Hawaii, United States of America, Pacific, North America

Florida manatees (Trichechus manatus latirostris), gather at Three Sisters Springs in Crystal River, Florida, United States of America, North America

The male oval squid (Sepioteuthis lessoniana), can reach 14 inches in length, Hawaii, United States of America, Pacific, North America

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

Day octopus (Octopus cyanea), in mid-water, Hawaii, United States of America, Pacific, North America

Day octopus (Octopus cyanea), in mid-water, Hawaii, United States of America, Pacific, North America

Humpback whales (Megaptera novaeangliae), underwater off the coast of Hawaii, United States of America, Pacific, North America

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

A green sea turtle (Chelonia mydas) makes its way to the surface off Maui, Hawaii, United States of America, Pacific, North America

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

A hard coral reef along with schooling anthias and reef fish, Crystal Bay, Bali island, Indonesia, Southeast Asia, Asia

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

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

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

Whale shark (Rhincodon typus) with a shoal of red fish evading predation, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Whale shark (Rhincodon typus) beneath a banca tour 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

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

Snorkeller swimming with a juvenile whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Whale shark (Rhincodon typus) with boat propeller injury, 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

Spinetail devil rays (Mobula mobular) engaged in sexual courtship in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia