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California gray whale (Eschrichtius robustus) calf above and below with whale watchers in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Underwater image of the inner lagoon of Apataki coral atoll, Palliser Islands, Tuamotus, French Polynesia, South Pacific, Pacific

Lion's mane jellyfish, Cyanea capillata, is the largest known species of jellyfish. Petersburg, Southeast Alaska, United States of America

Sally lightfoot crab (Grapsus grapsus) and marine iguana, Espinosa Point, Isla Fernandina (Fernandina Island), Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult humpback whale (Megaptera novaeangliae) surfacing off the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Close-up of the head of a giant moray (Gymnothorax javanicus), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Bladder wrack (Fucus vesiculosus) and sandstone patterns, Northumberland, England, United Kingdom, Europe

Hawksbill turtle (Eretmochelys) with a tracking device on its back, Dominica, West Indies, Caribbean, Central America

A rare longnose walking batfish (Ogcocephalus corniger) that usually lives at depths to 300m, Dominica, West Indies, Caribbean, Central America

Very well camouflaged plumed scorpionfish (Scorpaena grandicornis), Dominica, West Indies, Caribbean, Central America

Reeftop pipefish (Corythoichthys haematopterus), grows to 18cm, Indo-west Pacific waters, Philippines, Southeast Asia, Asia

Coral growth inside the wreck of the Lesleen M freighter, sunk as an artificial reef in 1985 in Anse Cochon Bay, St. Lucia, West Indies, Caribbean, Central America

California gray whale (Eschrichtius robustus) calf underwater with whale watchers in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Adult California gray whale (Eschritius robustus) flukes-up dive in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Adult tawny nurse shark (Nebrius ferrugineus) in the town of Rotoava, Fakarava, French Polynesia, South Pacific, Pacific

Adult coconut crab (Birgus latro) in the town of Tapana, Niau Atoll, Tuamotus, French Polynesia, South Pacific, Pacific

Adult humpback whale (Megaptera novaeangliae) surfacing off the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

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

Close-up of the head of a giant moray (Gymnothorax javanicus), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Giant barrel sponge (Xestosongia muta), and sunburst, St. Lucia, West Indies, Caribbean, Central America

Reef with male and female redfin anthias (Pseudanthias dispar), Sulawesi, Indonesia, Southeast Asia, Asia

Juvenile harlequin sweetlips (Plectorhinchus chaetodonoides), Sulawesi, Indonesia, Southeast Asia, Asia

Azure vase sponge and big nose butterflyfish (Forcipiger flavissimus), Sulawesi, Indonesia, Southeast Asia, Asia

California sea lions (Zalophus californianus), thermoregulating, Isla San Marcos, Baja California Sur, Mexico, North America

Adult blacktip reef shark (Carcharhinus melanopterus) underwater at Toau, Tuamotus, French Polynesia, South Pacific, Pacific

Colorful reef fish in the inner lagoon at Toau Atoll, Tuamotus, French Polynesia, South Pacific, Pacific

Palma Aquarium interior with diver feeding fish and sharks, Playa de Palma, Majorca, Balearic Islands, Spain, Europe

Great white shark (Carcharodon carcharias), Seal Island, False Bay, Simonstown, Western Cape, South Africa, Africa

Tropical coral reef scene, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Orbicular batfish (Platax orbicularis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Giant sponge showing how it filters water with the use of dye, Dominica, West Indies, Caribbean, Central America

Green turtle (Chelonia mydas) with remoras (Rachyucentron canadum), Sulawesi, Indonesia, Southeast Asia, Asia

Long-beaked common dolphin (Delphinus capensis) wake riding, Isla Danzante, Baja California Sur, Mexico, North America

Juvenile whale shark (Rhincodon typus) with a common remora attached in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Glasseye (Heteropriacanthus cruentatus) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Masked butterfly fish (Chaetodon semilarvatus) close-up, Naama Bay, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Blotcheye soldierfish (Myripristis murdjan), Naama Bay, Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

School of blackbar soldierfish (Myripristis jacobus), Dominica, West Indies, Caribbean, Central America

Dive guide culling Pacific lionfish which have infested the Caribbean, Dominica, West Indies, Caribbean, Central America

California sea lion bull (Zalophus californianus) half above and half below with snorkeler at Los Islotes, Baja California Sur, Mexico, North America