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