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Curious adult dwarf minke whale (Balaenoptera acutorostrata), underwater near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific

Adult dwarf minke whale (Balaenoptera acutorostrata), underwater with snorkeler near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific

Underwater view of giant clam (Tridacna spp), Pixies Bommie, Great Barrier Reef, Queensland, Australia, Pacific

Adult dwarf minke whale (Balaenoptera acutorostrata) underwater near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific

Adult female dwarf minke whale (Balaenoptera acutorostrata) underwater near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific

Adult dwarf minke whale (Balaenoptera acutorostrata), underwater near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific

Underwater view of giant clam (Tridacna spp), Pixies Bommie, Great Barrier Reef, Queensland, Australia, Pacific

A bright yellow jellyfish (Cotylorhiza tuberculata) in the Mediterranean Sea by the coast of Santa Teresa di Gallura, Sardinia, Italy, Mediterranean, Europe

California sea lions (Zalophus californianus), playing underwater at Los Islotes, Baja California Sur, Mexico, North America

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

Aerial view of Le Morne Brabant and the Underwater Waterfall optical illusion and natural phenomena, Mauritius, Indian Ocean, Africa

Snap on the water at Stingray City, a reserve hosting tens of stingray circling in the shallow lagoon, Antigua, Leeward Islands, West Indies, Caribbean, Central America

Antarctica fur seal pup (Arctocephalus gazella), above and below underwater in Husvik Bay, South Georgia, Polar Regions

A school of razorfish (Aeoliscus strigatus), suspended upside down on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A school of razorfish (Aeoliscus strigatus), suspended upside down on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Profusion of hard and soft corals and reef fish underwater on Mengiatan Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A school of striped catfish (Plotosus lineatus) on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Adult broadclub cuttlefish (Sepia latimanus) on the reef at Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Profusion of hard and soft corals as well as reef fish underwater at Batu Bolong, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Adult broadclub cuttlefish (Sepia latimanus) mating on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Red crinoid on Tengah Kecil Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Profusion of hard and soft corals on Tengah Kecil Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

An adult snowflake moray (Echidna nebulosa) on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Adult broadclub cuttlefish (Sepia latimanus) on the reef at Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Banded sea krait (Laticauda colubrina) searching for food on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Adult broadclub cuttlefish (Sepia latimanus) courtship display, Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Adult tomato clownfish (Amphiprion frenatus), Mengiatan Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A profusion of hard and soft corals on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Adult spinecheek anemonefish (Premnas biaculeatus), Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

False clown anemonefish (Amphiprion ocellaris), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

False clown anemonefish (Amphiprion ocellaris), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

An adult manta ray (Manta birostris) at Makaser, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A profusion of hard and soft corals on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Adult spinecheek anemonefish (Premnas biaculeatus), Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A profusion of baitfish underwater on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A school of bigeye trevally (Caranx sexfasciatus) on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Woman holding two red starfish snorkeling in the turquoise sea in summer, Zanzibar, Tanzania, East Africa, Africa

Man and woman with scuba masks showing starfish swimming underwater in the exotic lagoon, Zanzibar, Tanzania, East Africa, Africa

Woman showing a yellow starfish underwater in the tropical lagoon, Zanzibar, Tanzania, East Africa, Africa

Mother and son with scuba masks showing red starfish underwater, Zanzibar, Tanzania, East Africa, Africa

Exotic starfish under the breaking waves in the transparent water of the Indian Ocean, Zanzibar, Tanzania, East Africa, Africa

An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America

Juvenile Galapagos sea lion (Zalophus wollebaeki) underwater on Rabida Island, Galapagos, Ecuador, South America

Adult bull Galapagos fur seal (Arctocephalus galapagoensis) underwater on Genovesa Island, Galapagos, Ecuador, South America

Pacific green sea turtle (Chelonia mydas) underwater on Fernandina Island, Galapagos, Ecuador, South America

Pacific green sea turtles (Chelonia mydas) underwater on Fernandina Island, Galapagos, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) swimming underwater at Bartolome Island, Galapagos, Ecuador, South America

Galapagos penguins (Spheniscus mendiculus) swimming underwater at Bartolome Island, Galapagos, Ecuador, South America

Bull Galapagos sea lion (Zalophus wollebaeki) with snorkeler underwater at Santiago Island, Galapagos, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) underwater at Santiago Island, Galapagos, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) swimming underwater at Bartolome Island, Galapagos, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus), feeding underwater, Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding underwater, Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

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

An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America

Pacific green sea turtle (Chelonia mydas agassizi), Post Office Bay, Floreana Island, Galapagos Islands, Ecuador, South America

Galapagos sea lions (Zalophus californianus wollebaeki), underwater, Santa Fe Island, Galapagos Islands. Ecuador, South America

Humpback whale (Megaptera novaeangliae), adult underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Humpback whale (Megaptera novaeangliae), mother and calf underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Humpback whale (Megaptera novaeangliae), adult underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Remains of the Kinsei Maru shipwreck on the northeast side of the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Short-finned pilot whale (Globicephala macrorhynchus), underwater off Isla San Marcos, Baja California Sur, Mexico, North America

Short-finned pilot whale (Globicephala macrorhynchus), underwater off Isla San Marcos, Baja California Sur, Mexico, North America

Short-finned pilot whale (Globicephala macrorhynchus), underwater off Isla San Marcos, Baja California Sur, Mexico, North America

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

Juvenile whale shark (Rhincodon typus), underwater near Los Islotes, Baja California Sur, Mexico, North America

Juvenile whale shark (Rhincodon typus), underwater near Los Islotes, Baja California Sur, Mexico, North America

Curious California sea lions (Zalophus californianus), underwater at Los Islotes, Baja California Sur, Mexico, North America

A woman harvesting seaweed at one of the underwater farms, Paje, Zanzibar, Tanzania, East Africa, Africa

Adult bottlenose dolphins (Tursiops truncatus) bowriding underwater, Isla San Pedro Martir, Baja California, Mexico, North America

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

California gray whale calf (Eschrichtius robustus), with human hands, San Ignacio Lagoon, Baja California Sur, Mexico, North America

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

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

A Crown of Thorns starfish (Acanthaster planci), on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A shoal of Blue-striped Snappers (Lutjanus kasmira) swims across a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A shoal of Blue-striped Snappers (Lutjanus kasmira) swims across a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A diver around a Stylophora species hard coral, on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives. Indian Ocean, Asia

A gorgonian sea fan (possibly Echinogorgia species) octocoral on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A shoal of Yellowback Fusiliers (Caesio teres) swim around Acropora species hard corals, Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A mix of Acropora species hard corals, on a tropical coral reef, around Gaafu Dhaalu atoll, in the south of The Maldives, Indian Ocean, Asia

Small reef fish crowd around outcrops of Pocillopora species hard corals, a coral reef in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A mix of Acropora species hard corals, on a tropical coral reef, around Gaafu Dhaalu atoll, in the south of The Maldives, Indian Ocean, Asia

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

Young whale shark (Rhincodon typus), filter feeding near snorkeler at El Mogote, Baja California Sur, Mexico, North America

Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America

Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America

Young whale shark (Rhincodon typus), filter feeding near snorkeler at El Mogote, Baja California Sur, Mexico, North America

Young whale shark (Rhincodon typus), being biopsied by researcher at El Mogote, Baja California Sur, Mexico, North America

A curious adult leopard seal (Hydrurga leptonyx), underwater near Coronation Island, Antarctica, Polar Regions

Humpback whale (Megaptera novaeangliae), mother and calf underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Adult male Galapagos marine iguana (Amblyrhynchus cristatus), underwater, Fernandina Island, Galapagos, Ecuador, South America