Norbert Wu / Humpback Anglerfish (Melanocetus johnsoni) deep sea species showing bioluminescent fishing pole attracts deep sea prey, California

Norbert Wu / Devil Angler (Linophryne indica) fish, deep sea species showing large female with dwarf male attached

Norbert Wu / Humpback Anglerfish (Melanocetus johnsoni) deep sea species showing fishing pole with bioluminescent lure used to attract prey

Norbert Wu / Red Mangrove (Rhizophora mangle) roots create sediment filter to clear water, young trees rise up from salt water, Palau

Norbert Wu / California Sea Lion (Zalophus californianus) playing in shallow water, Channel Islands, California

Norbert Wu / Ice floes that have broken off sea ice edge in late summer, coast guard icebreaker in background, McMurdo Sound, Antarctica

Norbert Wu / Orca (Orcinus orca) pod surfacing in icebreaker channel, must find open pockets of water to breathe, McMurdo Sound, Antarctica

Norbert Wu / Bald Notothen (Pagothenia borchgrevinki) living on grounded iceberg, fish has glycoproteins that acts as antifreeze in blood to keep from freezing, Antarctica

Norbert Wu / Jellyfish (Periphylla periphylla) being eaten by Anemone (Isotealia antarctica), Antarctica

Norbert Wu / Humboldt Squid (Dosidicus gigas) reaches five feet and 50 pounds, a voracious carnivore, Sea of Cortez, Baja California, Mexico

Norbert Wu / Scuba diver exploring ice caves below Weddell Seal (Leptonychotes weddellii) breathing holes, life below feeds on seal feces, Antarctica

Norbert Wu / Emperor Penguin (Aptenodytes forsteri) group swimming quickly with bubble trail, can dive to 600 meters and stay down for 20 minutes, Antarctica

Norbert Wu / Goldman's Sweetlips (Plectorhinchus goldmanni) school, Papua New Guinea

Norbert Wu / Sergeant Major (Abudefduf vaigiensis) with Basslet (Pseudanthias sp) and Fairy Basslet (Pseudanthias squamipinnis) schools around coral reef, Australia

Norbert Wu / Harbor Seal (Phoca vitulina) swimming underwater, Monterey, California

Norbert Wu / Giant Kelp (Macrocystis pyrifera) forms dark, lush canopy forest in cold waters, southern California

Norbert Wu / Sea Otter (Enhydra lutris) creates healthier Kelp forest by eating Abalone, California

Norbert Wu / The Blue Hole, largest underwater sinkhole and popular diving site, Lighthouse Reef, Belize

Norbert Wu / Nudibranch (Chromodoris sp) breathes through gills on back, Borneo

Norbert Wu / Elephant Ear Sponge (Ianthella basta) with schools of Black-tipped Fusiliers (Pterocaesio digramma) swimming behind, Solomon Islands

Norbert Wu / Great White Shark (Carcharodon carcharias) near divers in shark cage, Australia

Norbert Wu / Australian Sea Lion (Neophoca cinerea) group swimming over seaweed, South Australia

Norbert Wu / West Indian Manatee (Trichechus manatus), Crystal River, Florida

Norbert Wu / Flamingo Tongue Snail (Cyphoma gibbosum) feeding on Common Sea Fan (Gorgonia ventalina) showing deep purple tone where the Sea Fan has released protective compounds, Saba, Caribbean

Norbert Wu / Coral Grouper (Cephalopholis miniata) changes color to match surroundings and mood, Red Sea, Egypt

Norbert Wu / Goose Barnacle (Lepas sp) group filter feeding, attached to fisherman's float, North Pacific

Norbert Wu / Scuba diver and salp chain showing asexual reproduction of salps, southern California

Norbert Wu / Scuba diver among colorful corals

Norbert Wu / Blackfinned Clownfish (Amphiprion percula) trio gain protection among stinging tentacles of Anemone, Papua New Guinea

Norbert Wu / Sunlight shafting through blue water, Pacific Ocean

Norbert Wu / Green Sea Turtle (Chelonia mydas) being cleaned by reef fish, Hawaii

Norbert Wu / Orange Tube Coral (Tubastraea aurea) polyps extended only at night, Dutch Antilles, Caribbean

Norbert Wu / Sipadan Island, a rich oceanic island surrounded by coral reef, Borneo

Norbert Wu / Medusa (Desmonema glaciale) near the surface, bell can reach over one meter in diameter, Antarctica

Norbert Wu / Palm (Arecaceae) trees on tropical island, Papua New Guinea

Norbert Wu / Garibaldi (Hypsypops rubicundus) and Pacific Jack Mackerel (Trachurus symmetricus) school in Giant Kelp (Macrocystis pyrifera) forest, Catalina Island, California

Norbert Wu / Garibaldi (Hypsypops rubicundus) and Pacific Jack Mackerel (Trachurus symmetricus) school in Giant Kelp (Macrocystis pyrifera) forest, Catalina Island, California

Norbert Wu / Whale Shark (Rhincodon typus) feeding on plankton off Isla Mujeres, Mexico

Norbert Wu / Clown Anemonefish (Amphiprion ocellaris) among stinging tentacles of anemone, Komodo Island, Indonesia

Norbert Wu / Caribbean Reef Shark (Carcharhinus perezii) swimming through reef and schooling fish, Bahamas, Caribbean

Norbert Wu / Tiger Shark (Galeocerdo cuvieri) portrait, Bahamas, Caribbean

Norbert Wu / Gentoo Penguin (Pygoscelis papua) pair, Cuverville Island, Antarctica Peninsula, Antarctica

Norbert Wu / Green Sea Turtle (Chelonia mydas) being cleaned by Yellow-eyed Surgeonfish (Ctenochaetus strigosus), Hawaii

Norbert Wu / Perry submersible used to bring tourists to deep sea, 1,000 meters depth, Grand Cayman, Caribbean

Norbert Wu / Iguacu Falls, world's largest waterfalls, Brazil and Argentina border

Norbert Wu / Loggerhead Sea Turtle (Caretta caretta) two to three year-old juvenile swimming at surface, Florida

Norbert Wu / Blue Shark (Prionace glauca), San Diego, California

Norbert Wu / California Bigeye Octopus (Octopus californicus) deep sea species swimming underwater, California