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 / Striped Catfish (Plotosus lineatus) school, Bali, Indonesia

Norbert Wu / Oceanic White-tip Shark (Carcharhinus longimanus) with Pilot Fish (Naucrates ductor), Bahamas, Caribbean

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 / Desert Tortoise (Gopherus agassizii), Nevada

Norbert Wu / Dromedary (Camelus dromedarius) camel group resting, Sahara Desert, Aswan, Egypt

Norbert Wu / Small-toothed Rock Hyrax (Heterohyrax brucei) group lounging around pool at Mara Serena lodge, closest living relative of the Elephant, feet possess hoof-like nails, Kenya

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

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 / Bottlenose Dolphin (Tursiops truncatus) chases a school of Bigeye Scad (Selar crumenophthalmus), Roatan, Honduras

Norbert Wu / Loggerhead Sea Turtle (Caretta caretta), 2-3 year old juvenile swimming, Florida

Norbert Wu / Caribbean Reef Shark (Carcharhinus perezii) with remora attached, Bahamas, Caribbean

Norbert Wu / Scalloped Hammerhead Shark (Sphyrna lewini) schooling around a seamount, Cocos Island Costa Rica Pacific Ocean

Norbert Wu / Morning Sun Star (Solaster dawsoni) fed on by Rose Anemone, Queen Charlotte Islands, Canada

Norbert Wu / Atlantic Bluefin Tuna (Thunnus thynnus) examinded with flashlights by buyers to determine the quality of the meat, Tsukiji Market, Tokyo, Japan

Norbert Wu / Lavenberg's Gulper-eel (Saccopharynx lavenbergi) deep sea species with hinged mouth swings wide open to accommodate large prey, deep sea, Guadalupe Island

Norbert Wu / Viperfish (Chauliodus sp) attacking Mysids, luring prey with photophores, deep sea

Norbert Wu / Viperfish (Chauliodus sloani) light organs in mouth and all along body, southeastern Pacific, deep sea

Norbert Wu / Rainbow Trout (Oncorhynchus mykiss) pair, side view, western United States

Norbert Wu / Caribbean Reef Shark (Carcharhinus perezii) underwater, Caribbean, Bahamas

Norbert Wu / Bigeye Trevally (Caranx sexfasciatus) school form a moving circle, Borneo

Norbert Wu / Toco Toucan (Ramphastos toco) bill is actually light and spongy, Brazil

Norbert Wu / Toco Toucan (Ramphastos toco) bill is actually light and spongy, Brazil

Norbert Wu / Idyllic beach, palm tree and tropical island, Solomon Islands

Norbert Wu / Amazon River Dolphin (Inia geoffrensis) melon on forehead used for sonar, Pittsburg Aquarium

Norbert Wu / Granite Island and Coconut Palms, unique idyllic islands, Seychelles, Indian Ocean

Norbert Wu / Whale Shark (Rhincodon typus) largest fish in the world to 60 feet, Seychelles

Norbert Wu / Coral sand beaches with unique granite formations, Seychelles

Norbert Wu / Chambered Nautilus (Nautilus pompilius) comes up from great depths at night to shallows, Palau

Norbert Wu / Aerial view of the Rock Islands of Palau, the limestone islands have been eroded into mushroom-like formations

Norbert Wu / Atlantic Bluefin Tuna (Thunnus thynnus) underwater, Sardinia, Italy, Mediterranean Sea

Norbert Wu / Atlantic Bluefin Tuna (Thunnus thynnus) school in Mediterranean Sea, Sardinia, Italy

Norbert Wu / Atlantic Spotted Dolphin (Stenella frontalis), Little Bahama Bank, Caribbean

Norbert Wu / Hawksbill Sea Turtle (Eretmochelys imbricata) underwater, Sipadan Island, Borneo

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

Norbert Wu / Atlantic Spotted Dolphin (Stenella frontalis) swimming with Katherine Gilman, Little Bahama Bank, Caribbean

Norbert Wu / Spotted Seahorse (Hippocampus erectus) male who has just given birth to babies, surrounded by his offspring

Norbert Wu / Bumblebee (Bombus sp) collecting pollen from a daisy, California

Norbert Wu / California Sea Lion (Zalophus californianus) swimming underwater with mouth open in threat display, California

Norbert Wu / Atlantic Spotted Dolphin (Stenella frontalis) silhouetted group swimming overhead, Little Bahama Bank, Caribbean

Norbert Wu / Arizona Mountain King Snake (Lampropeltis pyromelana) on branch, Arizona

Norbert Wu / Bald Notothen (Pagothenia borchgrevinki) living in iceberg, notothenioid fish has glycoproteins for antifreeze in blood to keep from freezing, silvery color acts as camouflage, Antarctica

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

Norbert Wu / Australian Ghost Shark (Callorhinchus milii) trunk-like snout detects prey in sea bottom, primitive fish relative to sharks, lives in the deep sea, New Zealand

Norbert Wu / Old-world Chameleons, male and female preparing to mate, Africa

Norbert Wu / Weddell Seal (Leptonychotes weddellii) mother and newborn pup, Antarctica

Norbert Wu / Pacific Sailfish (Istiophorus platypterus) underwater, fastest fish, 68 miles per hour, Sea of Cortez, Baja California, Mexico

Norbert Wu / Coral sand beaches with unique granite formations, Seychelles

Norbert Wu / Leafy Sea Dragon (Phycodurus eques) spectacular example of camouflage, for both protection and ambush feeding endemic to South Australia

Norbert Wu / Emperor Penguin (Aptenodytes forsteri) two chicks, parents can recognize chick's call among 50, 000 birds, Antarctica

Norbert Wu / Emperor Penguin (Aptenodytes forsteri) group seeking rookery, may walk 100 miles to reach rookery, Antarctica

Norbert Wu / Emperor Penguin (Aptenodytes forsteri) group on ice edge, calls are used to recognize each other and form pairs for mating, Antarctica

Norbert Wu / Coast guard icebreaker travels through ice floes which have broker off sea ice edge in late summer, McMurdo Sound, Antarctica

Norbert Wu / Larvacean (Oikopleura labradorensis) house, primitive animal spins mucus web, Arctic

Norbert Wu / Swordfish (Xiphias gladius) worldwide, can tolerate temperatures of five degrees Celsius and dive to 650 meters, uses sword to kill prey such as squid, can grow to 14 feet and 1200 pounds, Sardinia, I...

Norbert Wu / Weddell Seal (Leptonychotes weddellii) male showing aggression towards the diver who is near breathing hole, Antarctica

Norbert Wu / Spotted Ratfish (Hydrolagus colliei) deep sea fish, Monterey, California