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A harlequin swimming crab (Lissocarcinus laevis) sits on the seafloor of Lembeh Strait, Indonesia.
Detail of the polyps of a Goniopora coral growing in Lembeh Strait, Indonesia.
Detail of the colorful tentacles on a bulbed anemone, Entacmaea quadricolor, growing on a reef near Alor in Indonesia.
Specialized mangrove roots, called pneumatophores, rise from the shallow seafloor in Alor, Indonesia.
A pink anemonefish, Amphiprion perideraion, swims above its beautiful host anemone in Wakatobi National Park, Indonesia.
A pair of Chromodoris annae nudibranch crawl on a large tunicate among the remote, tropical islands of Raja Ampat, Indonesia.
A vibrant nudibranch, Chromodoris sp., crawls across a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.
A pair of vibrant nudibranchs, Nembrotha kubaryana, mate on a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.
A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.
A school of silversides swims in the shallows in a remote part of Raja Ampat, Indonesia.
A beautiful coral reef grows in a remote part of Raja Ampat, Indonesia.
A school of lined sweetlips, Plectorhinchus lineatus, swim above a healthy coral reef in Raja Ampat, Indonesia.
A beautiful bouquet of tunicates and cnidarians grows on a reef in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.
A colorful nudibranch, Hypselodoris tryoni, crawls across a sandy sea floor in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.
A Florida manatee, Trichechus manatus latirostris, rises to the surface of Crystal River, Florida. This endangered sirenian subspecies migrates to inland rivers during the winter where water temperatures are warmer than the ocean.
A loggerhead sea turtle, Caretta caretta, swims over a deep coral reef on Turneffe Atoll, Belize.
Healthy corals grow on a vibrant reef in Raja Ampat, Indonesia.
Detail of a sponge growing on a reef in Lembeh Strait, Indonesia.
A blue starfish, Linkia laevigata, clings to coralline algae on a reef in Sulawesi, Indonesia.
A beautiful coral reef thrives around an island in a remote part of Raja Ampat, Indonesia.
Beautiful corals and reef fish thrive amid the tropical islands of Raja Ampat, Indonesia.
A beautiful coral reef thrives around an island in a remote part of Raja Ampat, Indonesia.
A beautiful coral reef thrives amid the tropical islands of Raja Ampat, Indonesia.
A school of blue-green damselfish, Chromis viridis, hovers amid the tropical islands of Raja Ampat, Indonesia.
Humbug damselfish hover above protective corals in Raja Ampat, Indonesia.
A large manta ray, Mobula alfredi, swimming along a reef drop off in Raja Ampat, Indonesia.
A colorful coral reef grows amid the tropical islands of Raja Ampat, Indonesia.
A colorful flamboyant cuttlefish, Metasepia pfefferi, crawls across the sandy seafloor in Lembeh Strait, Indonesia.
Beautiful coral polyps grow close together in a vibrant colony amid the tropical islands of Raja Ampat, Indonesia.
A thick school of yellow-striped scad swims below a jetty amid the tropical islands of Raja Ampat, Indonesia.
A brightly colored soft coral adorns a beautiful coral reef in Raja Ampat, Indonesia.
A vibrant and diverse coral reef grows amid the tropical islands of Raja Ampat, Indonesia.
A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.
A bright yellow crinoid clings to a healthy coral reef near Alor, Indonesia.
A starry night octopus, Callistoctopus luteus, searches for prey on a reef flat at night in Raja Ampat, Indonesia.
Detail of a reef-building coral colony, Favia sp., growing on a healthy reef in Komodo National Park, Indonesia.
A beautiful coral reef thrives in shallow water in Indonesia's Banda Sea. This part of eastern Indonesia is home to part of the world's greatest marine biodiversity.
A beautiful coral reef thrives in shallow water in Indonesia's Banda Sea.
A young humpback whale plays on the surface.
Two nudibranchs with two emperor shrimp riding on their backs, Tulamben, Bali, Indonesia.
The curled arm of a crinoid, Anilao, Philippines.
Two mandarinfish spawn and release eggs, Anilao, Philippines.
Striated hairy frogfish yawning, Anilao, Philippines.
A tiny white hairy frogfish, Anilao, Philippines.
Two shrimp on a whip coral, Anilao, Philippines.
A banded pipefish hovers above the substrait where it lives, Anilao, Philippines.
A lionfish portrait, Anilao, Philippines.
A manta ray passes overhead under the sun, Socorro Island, Mexico.
A silky shark swims against a school of black jacks, Socorro Island, Mexico.
A reef squid hovers in mid-water, Anilao, Philippines.
A cuttlefish hunts at night, Anilao, Philippines.
Bubble coral shrimp, Anilao, Philippines.
Striped catfish swim in schools feeding one in front of the other, Anilao, Philippines.
The ocean is beautiful just under the surface near the desolate desert of Egypt.
A school of unicorn fish hover over the Yolanda wreck, Red Sea, Egypt.
Schooling fish in vibrant yellow hover over a coral reef in Raja Ampat, Indonesia.
Huge table corals cover a reef in Indonesia that is teeming with fish, Raja Ampat, Indonesia.
Crocodile under water, Caribbean Sea, Mexico.
An orangethroat pike blenny (Chaenopsis alepidota), displays its colors in hopes of attracting a mate, Sea of Cortez.
Panamic cushion stars (Pentaceraster cumingi), gather on the sea floor, Sea of Cortez.
A porcelain crab broods eggs under its carapace, Raja Ampat, Indonesia.
A longarm octopus flashes its colors at night, Anilao, Philippines.
A female paper nautilus swims through the black water in search of a mate, Anilao, Philippines.
A coconut octopus makes its way over a tangle of sea weed, Anilao, Philippines.
A painted frog fish stalks its prey blending in with sponges that are also the same color, Anilao, Philippines.
Blacktip reef sharks patrol the shallow waters around a small island in Tahiti, French Polynesia.
A trio of rays swim down a sandy gulch in the Indian Ocean, Maldives.
A school of yellow snapper hovers close to a coral reef, Maldives.
A school of sweetlip fish stacked up against a coral head, Maldives.
Several anemonefish wait outside while their anemone host closes up to feed, Raja Ampat, Indonesia.
A coral bommie full of life, Maldives.
A leopard shark swims close to a coral reef, Maldives.
A coral bommie in the Red Sea at Yolanda Reef is full of anthias fish.
Young adult bull southern elephant seal (Mirounga leonina) close up while swimming in glacier run off, South Georgia Island, Polar Regions
Views of the wreck of the Guvernoren, a 20th century whale processing ship, in the Enterprise Islands, Antarctica, Polar Regions
Southern right whale (Eubalaena australis) adult female flukes-up to catch the wind in Puerto Pyramides, Argentina, South America
Adult humpback whales (Megaptera novaeangliae) flukes-up dive in Snow Pass, Southeast Alaska, Pacific Ocean, United States of America, North America
Adult humpback whales (Megaptera novaeangliae) flukes-up dive in Snow Pass at sunset, Southeast Alaska, United States of America, North America
Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Snow Pass, Alaska, United States of America, North America
Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding, Southeast Alaska, United States of America, North America
Adult female sea otter (Enhydra lutris kenyoni) swimming in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America
Adult female sea otter (Enhydra lutris kenyoni) eating urchins she has gathered off the sea floor in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America
A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions
A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions
Humpback whale (Megaptera novaeangliae), surfacing off Half Moon Island in the South Shetland Island Group, Antarctica, Polar Regions
Curious crabeater seals (Lobodon carcinophaga), swimming near iceberg at Booth Island near the Antarctic Peninsula, Polar Regions
Common lionfish (Pterois miles) surrounded by snack food.
Lined squat lobster (Raymunida lineata), Anilao, Philippines.
A longspine grouper (Epinephelus longispinis) being cleaned by a cleaner wrasse (Labroides dimidiatus).
Humpback whale (Megaptera novaeangliae) calf playing at the surface.
Humpback whale (Megaptera novaeangliae) calf learning to slap the water surface.
Humpback whale (Megaptera novaeangliae) mother and her calf.
Ceratosoma nudibranch, Anilao, Philippines.
Denise's pygmy seahorse (Hippocampus denise), Kimbe Bay, Papua New Guinea.
Saltwater crocodile of Cuba.
Common ghost goby (Pleurosicya mossambica), Kimbe Bay, Papua New Guinea.
A juvenile ornate ghost pipefish (Solenostomus paradoxus).
Saltwater crocodile of Cuba.
Eye detail of a juvenile crocodilefish, New Ireland, Papua New Guinea.
Hairy squat lobster (Lauriea siagiani), Anilao, Philippines.