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Playful California sea lions (Zalophus californianus), with mooring ball at Los Islotes, Baja California Sur, Mexico, North America

California sea lion (Zalophus californianus), half above and half under at Los Islotes, Baja California Sur, Mexico, North America

Adult short-finned pilot whale (Globicephala macrorhynchus), surfacing near Isla Danzante, Baja California Sur, Mexico, North America

Short-finned pilot whales (Globicephala macrorhynchus), surfacing near Isla Danzante, Baja California Sur, Mexico, North America

Bull short-finned pilot whale (Globicephala macrorhynchus), surfacing near Isla Danzante, Baja California Sur, Mexico, North America

Humpback Whale (Megaptera novaeangliae) fluke, watched by tourists in zodiac, Torgersen Island, Antarctic Peninsula, Antarctica, Polar Regions

Adult bottlenose dolphin (Tursiops truncatus), with remora attached in Roroia, Tuamotus, French Polynesia, South Pacific, Pacific

Adult common bottlenose dolphins (Tursiops truncatus) leaping near shore, Rangiroa, Tuamotus, French Polynesia, South Pacific, Pacific

Adult bottlenose dolphin (Tursiops truncatus) with remora attached in Roroia, Tuamotus, French Polynesia, South Pacific, Pacific

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

Adult grey reef shark (Carcharhinus amblyrhynchos) in Tumakohua Pass, Fakarava, French Polynesia, South Pacific, Pacific

Adult blacktip reef shark (Carcharhinus melanopterus) underwater, Fakarava, 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

Adult tawny nurse shark (Nebrius ferrugineus) being fed by hand in Rotoava, Fakarava, French Polynesia, South Pacific, Pacific

Giant stingray (Dasyatis spp) cruising with tourists in the shallow waters of Stingray City, 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 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 sharks (Carcharhinus melanopterus) cruising the shallow waters of Moorea, Society Islands, French Polynesia, South Pacific, Pacific

Giant stingray (Dasyatis spp), being fed by local guide in the shallow waters of Stingray City, 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

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

Whale shark (Rhincodon typus) with rainbow runner, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

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

Tourist swimming with a whale shark (Rhincodon typus) 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

Whale shark (Rhincodon typus) with golden trevally (Gnathanodon speciosus), 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 and tour guide swimming with a whale shark (Rhincodon typus) 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 with a juvenile whale shark (Rhincodon typus) feeding on the suface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Whale shark (Rhincodon typus) swimming beneath the surface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Whale shark (Rhincodon typus) vertical suction feeding on a shoal of red fish, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Whale shark (Rhincodon typus) swimming past a jellyfish (Thysanostoma loriferum), 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

Snorkeller with oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Oceanic manta ray (Manta birostris) feeding near the surface, 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

A group of snorkellers observing spinetail devil rays (Mobula mobular) engaged in sexual courtship in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Oceanic manta ray (Manta birostris) feeding near the surface, 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

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

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

Oceanic manta ray (Manta birostris) feeding near the surface, 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

Snorkellers with an oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Oceanic manta ray (Manta birostris) feeding near the surface, 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

The morning view of The London Eye and London Aquarium viewed from Westminster Bridge, London, England, United Kingdom, Europe

Close-up view of a lionfish (Pterois volitans), Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Schooling yellowmask surgeonfish (Acanthurus mata) and blue and yellow fusilier fish (Caesio teres) at the upstream side of Mike's Point, Raja Ampat, Indonesia, Southeast Asia, Asia

Thorny seahorse (Hippocampus histrix), side view, red and pink with yellow markings, Tulamben, Bali, Indonesia, Southeast Asia, Asia

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

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

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

Baby harbour seal, Phoca vitulina, downtown docks, Seattle, Washington, United States of America, North America

Resident killer whale, Orcinus orca, spy-hopping in Cattle Pass, San Juan Island, Washington, United States of America, North America

A female blacktip reef shark (Carcharhinus melanopterus), off the island of Yap, Micronesia, Pacific

Emperor angelfish (Pomacanthus imperator) close-up, Naama Bay, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

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

Ringed pipefish (Dunckerocampus dactyliophorus), grows to 18cm, Indo-Pacific waters, Philippines, Southeast Asia, Asia

White eyed moray eel (Siderea thysoidea) blind in one eye, Sulawesi, Indonesia, Southeast Asia, Asia

Adult bottlenose dolphin (Tursiops truncatus) leaping in Roroia, Tuamotus, French Polynesia, South Pacific, Pacific