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Nudibranch (Chromodoris albopunctata), grows to 65mm, Indo-Pacific waters, Philippines, Southeast Asia, Asia

Azure vase sponge (Callyspongia plicifera), and sunburst, St. Lucia, West Indies, Caribbean, Central America

Yellowline arrow crab (Stenorhynchus seticornis), St. Lucia, West Indies, Caribbean, Central America

Yellowline arrow crab (Stenorhynchus seticornis), St. Lucia, West Indies, Caribbean, Central America

Hypselodoris bullockii nudibranch, grows to 70mm, Indo-west Pacific waters, varies greatly in colours, Philippines, Southeast Asia, Asia

Golden damsel fish (Amblyglyphidodon aureus) in a coral encrusted bottle, Sulawesi, Indonesia, Southeast Asia, Asia

Mimic filefish (Paraluteres prionurus) minics black saddled toby, Sulawesi, Indonesia, Southeast Asia, Asia

California gray whale calf (Eschritius robustus), half above half below, San Ignacio Lagoon, Baja California Sur, Mexico, North America

A pod of common bottlenose dolphins (Tursiops truncatus), underwater at El Mogote, Baja California Sur, Mexico, North America

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

California sea lion (Zalophus californianus) underwater 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

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 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 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

Humpback whale (Megaptera novaeangliae), underwater, Hawaii, United States of America, Pacific, North America

A black and yellow ornate ghost pipefish (Solenostomus paradoxus) pictured against coral, Russell Islands, Solomon Islands, South Pacific, Pacific

Bigfin reef squid (Sepioteuthis lessoniana), tending eggs which have been laid along a buoy line, taken at dusk, Lembeh Strait, Indonesia, Southeast Asia, Asia

A juvenile hairy frogfish (Antennarius striatus) of approximately 5mm long, Lembeh Strait, Indonesia, Southeast Asia, Asia

Colorful soft corals (Dendronephthya sp.) adorn the stunning reefs of southern Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Close-up view of the underside of a Hawksbill sea turtle, complete with barnacles, on a reef in Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Curious flightless cormorant (Phalacrocorax harrisi) underwater at Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

A young humpback whale (Megaptera novaeangliae), underwater, Hawaii, United States of America, Pacific, North America

Almaco jack (Seriola rivoliana), in the pen at a fish farm off The Big Island, Hawaii, United States of America, Pacific, North America

A cleaner shrimp (Lysmata amboinensis), inspects the teeth of an undulated moray eel, Hawaii, United States of America, Pacific, North America

A young Commerson's frogfish (Antennarius commerson), just three inches long, Hawaii, United States of America, Pacific, North America

The shell of Hawaiian reef lobster (Enoplometopus occidentalis), covered in algae and parasitic barnacles, Hawaii, United States of America, Pacific, North America

Schooling threadfin butterflyfish (Chaetodon auriga), in Rarotonga Lagoon, The Cook Islands, South Pacific, Pacific

Atlantic bottlenose dolphin (Tursiops truncatus), Curacao, Netherlands Antilles, Caribbean, Central America

Bubble coral shrimp (Vir philippinensis) on bubble coral (Plerogyra sp.), Philippines, Southeast Asia, Asia

These striped catfish (Plotosus lineatus) have a venomous spine in front of their pectoral fin, Philippines, Southeast Asia, Asia

A blackspotted puffer (Arothron nigropunctatus) curled up on the reef for the night, Philippines, Southeast Asia, Asia

Mantle detail on a spondylus (Thorny Oyster shell) (Spondylus varians), Philippines, Southeast Asia, Asia

A mother and juvenile Atlantic Bottlenose Dolphin (Tursiops truncatus), in the Bahama Banks, Bahamas, Central America

The Kona crab (Ranina ranina) (Spanner crab), Maui, Hawaii, United States of America, Pacific, North America

The graceful decorator crab (Oregonia gracilis), attaches organisms to its back, British Columbia, Canada, North America

Several green sea turtles (Chelonia mydas) gather at a cleaning station off West Maui, Hawaii, United States of America, Pacific, North America

The male oval squid (Sepioteuthis lessoniana), can reach 14 inches in length, Hawaii, United States of America, Pacific, North America

The porcelain crab (Neopetrolisthes maculatus), commensal in sea anemones, Philippines, Southeast Asia, Asia

Atlantic bottlenose dolphin (Tursiops truncatus), in training using only echolocation, Netherlands Antilles, Caribbean, Central America

Red Sea coral grouper (Plectropomus pessuliferus) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Emperor angelfish (Pomacanthus imperator) close to sandy seabed, Naama Bay, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Red sea anemone fish (Amphiprion bicinctus) and magnificent anemone, (Heteractis magnifica), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Raccoon butterflyfish (Chaetodon lunula) and saddle wrasse (Thalassoma duperrey), off the island of Lanai, Hawaii, United States of America, Pacific, North America

Scavenging sea stars and a humpback shrimp (Pandalus hypsinotus) working on the remains of a rock crab, Canada, North America

A humpback whale (Megaptera novaeangliae) glides through the blue waters of Hawaii, United States of America, Pacific, North America

Trumpetfish (Aulostomus chinensis) attempting to conceal itself in a school of milletseed butterflyfish, United States of America, North America

A gathering of robe hem hypselodoris nudibranchs (Hypselodoris apolegma), Komodo, Indonesia, Southeast Asia, Asia

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

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

Giant stingray (Dasyatis spp), being fed by local guide in the shallow waters of Stingray City, Society Islands, French Polynesia, South Pacific, Pacific

Spotted porcelain crab (Neopetrolisthes maculatus) in anemone, Gorontalo, Sulawesi Indonesia, Southeast Asia, Asia

A Coconut Octopus (Amphioctopus marginatus), a species that gathers coconut and mollusk shells for shelter, Lembeh Strait, Sulawesi, Indonesia, Southeast Asia, Asia

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

The reef manta ray (Manta alfredi) with yellow pilot fish in front of its mouth, Dampier Strait, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia