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An oceanic whitetip shark approaches from the blue waters around Elphinstone, Red Sea.
A larval lionfish floats in the open ocean as plankton, Anilao, Philippines.
A sea spider hunts in coral polyps for its dinner, Anilao, Philippines.
A tiny hard coral crab can be found burrowing in between the polyps of the coral, Anilao, Philippines.
A snail about the size of a coin generally lives under the sand but comes out at night to feed, Anilao, Philippines.
Blacktip reef sharks patrol the shallow waters around a small island in Tahiti, French Polynesia.
A honeycomb eel emerges from its den and appears to smile, Maldives.
Antarctic tern (Sterna vittata), feeding in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions
Adult bull southern elephant seal (Mirounga leonina) attempting to cool off by flinging sand on his back, South Georgia, Polar Regions
Adult beachmaster bull southern elephant seal (Mirounga leonina) holding female down with his weight, South Georgia, Polar Regions
Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions
Southern elephant seal (Mirounga leonina) weaner pup head detail on the beach at Gold Harbour on South Georgia, Polar Regions
Adult sea otter (Enhydra lutris kenyoni) mother with her pup on her chest in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America
Harbor seal (Phoca vitulina) hauled out on ice calved from South Sawyer Glacier, Southeast Alaska, United States of America, North America
Adult leopard seal (Hydrurga leptonyx), hauled out on ice floe at Dorian Bay near the Antarctic Peninsula, Southern Ocean, Polar Regions
An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America
A pod of killer whales (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America
Adult bull killer whale (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America
Southern elephant seals (Mirounga leonina), hauled out for their annual catastrophic molt (moult) on the beach at Snow Island, Antarctica, Polar Regions
Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe
Lava lizard (Microlophus spp) in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America
Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America
Galapagos sea lion pup (Zalophus wollebaeki) underwater playing with a lobster molt in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
The Lindblad Expedition ship National Geographic Explorer pushing through ice in the Svalbard Archipelago, Norway, Arctic, Europe
Tourist holding a green sea turtle (Chelonia mydas) hatchling at night on Long Beach on Ascension Island, South Atlantic Ocean
South American Sea Lion (Otaria byronia), Ballestas Islands, Paracas, Peru, South America
South American Sea Lions (Otaria byronia), Ballestas Islands, Paracas, Peru, South America
Gentoo penguin (Pygoscelis papua) adult feeding chick at Hannah Point on Livingston Island, Antarctica, Southern Ocean, Polar Regions
Gentoo penguin (Pygoscelis papua) breeding colony at Petermann Island, Antarctica, Southern Ocean, Polar Regions
Views of Base Presidente Eduardo Frei Montalva, Antarctica, Southern Ocean, Polar Regions
Argentine ship the Almirante Viel operating from Ushuaia, Argentina to the Antarctic Peninsula in Antarctica, Southern Ocean, Polar Regions
The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Adult California gray whales (Eschrictius robustus), spy-hopping in San Ignacio Lagoon, Baja California, Mexico, North America
A small pod of Type B killer whales (Orcinus nanus) just outside Duse Bay in the Weddell Sea, Antarctica, Polar Regions
Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia
Northern giant petrel (Macronectes halli) scavenging and feeding on a dead fur seal pup at St. Andrews Bay, South Georgia
Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island
Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island
Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island
Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island
Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island
Female southern elephant seal (Mirounga leonina) with newborn pup on the beach in Stromness Bay, South Georgia Island
Female southern elephant seal (Mirounga leonina) with newborn pup on the beach in Stromness Bay, South Georgia Island
Skuas (Catharacta antarctica) fight for the afterbirth of a southern elephant seal, South Georgia
Female southern elephant seal (Mirounga leonina) with newborn pup on the beach in Stromness Bay, South Georgia Island
Purple stove-pipe sponge (Aplysina archeri), with boat in background, Curacao.
A red, white and yellow Christmas tree worm (Spirobranchus giganteus), on coral, Curacao.
Goldentail moray eel (Gymnothorax miliaris), in coral reef, Curacao.
Chain moray eel (Echidna catenata), in coral reef, Curacao.
Headshot of a seaweed blenny (Parablennius marmoreus).
Christmas tree worms (Spirobranchus giganteus) on brain coral, Saint Croix, U.S. Virgin Islands.
Lined seahorse (Hippocampus erectus).
Tiger shark swimming over sand, Tiger Beach, Bahamas.
Green sea turtle with remora on back, Tiger Beach, Bahamas.
Great hammerhead shark turning, Tiger Beach, Bahamas.
Great hammerhead shark and tiger shark, Tiger Beach, Bahamas.
Great hammerhead shark, Tiger Beach, Bahamas.
Front view of a tiger shark, Tiger Beach, Bahamas.
Front view of a tiger shark, Tiger Beach, Bahamas.
Scuba divers interacting with a pair of tiger sharks, Tiger Beach, Bahamas.
Great hammerhead shark with mouth open, Tiger Beach, Bahamas.
Two sheephead (Semicossyphus pulcher) In a kelp forest, Catalina Island, California.
A Caribbean reef squid on a deepwater night dive in West Palm Beach, Florida.
A starfish with spiny sea urchins at Quadra Island, British Columbia in Canada.
Great hammerhead shark with mouth open, Tiger Beach, Bahamas.
A Caribbean reef squid on a deepwater night dive in West Palm Beach, Florida.
An oceanic whitetip shark (C. longimanus) and surface reflections at Cat Island in the Bahamas.
A boat captain watches an oceanic whitetip shark below at Cat Island in the Bahamas.
A giant oceanic manta ray (Mobula birostris) with attached remoras at San Benedicto island in Mexico.
A hawksbill sea turtle (Eretmochelys imbricata) feeds on sponge and an angelfish follows for scraps in Cozumel, Mexico.
A ribbon eel (Rhinomuraena quaesita) in Indonesia.
A Caribbean reef shark (Carcharhinus perezi) in the Turks and Caicos.
A large orange frogfish at Cocos Island in Costa Rica.
A reef manta ray (Mobula alfredi) feeding at night in Hawaii.
A scalloped hammerhead shark (Sphyrna lewini) at Socorros Island in Mexico.
A diver shines a light in on a cavern filled with glassy sweepers (Pempheris schomburgkii) at Molasses Reef in Key Largo, Florida.
A diver has a close encounter with an oceanic whitetip shark (Carcharhinus longimanus) at Cat Island in the Bahamas.
Arrow Crab close-up, West Palm Beach, Florida.
A pair of Christmas tree worms in Cozumel, Mexico.
A colorful reef scene with sunburst at Cozumel, Mexico.
A pair of pink nudibranchs, Lembeh Strait, Indonesia.
A loggerhead sea turtle off the coast of North Carolina.
An Atlantic Spadefish swims amongst the sunken wreck of USS Indra off the coast of North Carolina.
Sunrays shining on a Garibaldi damselfish, Catalina Island, California.
A bioluminescent tunicate, Catalina Island, California.
Spotted cleaner shrimp on pink tipped anemone in Curacao.
A hawksbill sea turtle resting under a reef in Cozumel, Mexico.
Kelp forest with school of fish, Catalina Island, California.
Oceanic whitetip shark circling a boat off Cat Island, Bahamas.
Diving with oceanic whitetip sharks, Cat Island, Bahamas.
Oceanic whitetip shark with dorsal fin reflection, Cat Island, Bahamas.
Diver swimming with oceanic whitetip sharks, Cat Island, Bahamas.
Oceanic whitetip shark with reflection, Cat Island, Bahamas.
A feeding hawksbill sea turtle in Cozumel, Mexico.
Diver swimming with an oceanic whitetip shark, Cat Island, Bahamas.
Close encounter with an oceanic whitetip shark, Cat Island, Bahamas.
Rays of light shining above an oceanic whitetip shark in Cat Island, Bahamas.
Diver and boat above black coral bushes in French Cay, Turks and Caicos.
Scuba diver swimming over a massive school of jack fish in Cabo Pulmo, Mexico