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

Snorkeller swimming with a juvenile whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Firehole Spring, Firehole Lake Drive, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Humpback whales, Megaptera novaeangliae, cooperatively bubble-net feeding in Chatham Strait, Alaska, United States of America

Humpback whales, Megaptera novaeangliae, cooperatively bubble-net feeding in Chatham Strait, Alaska, United States of America

Humpback whales, Megaptera novaeangliae, cooperatively bubble-net feeding in Chatham Strait, Alaska, United States of America

Underwater view of a scuba diver entering the water, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding, Snow Pass, Southeast Alaska, United States of America, North America

Kids playing in floating orbs, Hemispheric Buildings, City of Arts and Sciences, Valencia, Spain, Europe

Methane bubbles in the icy surface of Silsersee with snowy peak illuminated by sunset light, Lake Sils, Engadine Valley, canton of Graubunden, Switzerland, Europe

A young married couple celebrate their ten year anniversary by scuba diving in the clear freshwaters of Devil's Den Springs, a sinkhole in Williston, Florida, as the afternoon sun filters down into the cavern.

A scuba diver swims through an underwater field of tape grass leading away from the Blue Springs cave in Merritts Mill Pond in Marianna, Florida.

A scuba diver surfacing and looking up into the light as he ascends from the bottom of Devil's Den, a sinkhole in Williston, Florda.

November 2007 - Bubbles rising in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.

During the preparation for an ice dive, a chainsaw is working its way through the ice. This picture is from the underside of the ice in a flooded limestone quarry in Karlstrup, Denmark.

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Ice bubbles trapped in frozen Lake Sils at sunset with Piz Da La Margna in background, Engadine, Graubunden canton, Switzerland, Europe

Ice bubbles trapped in Lake Sils with Piz Da La Margna in background at dawn, Engadine, Graubunden canton, Switzerland, Europe

Clouds in the burning sky at sunset on Piz Da La Margna and ice bubbles trapped in Lake Sils, Engadine, Graubunden, Switzerland, Europe

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae), bubble-net feeding in Sitka Sound, Southeast Alaska, United States of America, North America

Juvenile Galapagos sea lion (Zalophus wollebaeki) underwater on Rabida Island, Galapagos, Ecuador, South America

Adult humpback whales (Megaptera novaeangliae), bubble-net feeding near Morris Reef, Southeast Alaska, United States of America, North America

Adult humpback whales (Megaptera novaeangliae), bubble-net feeding in Sitka Sound, Southeast Alaska, United States of America, North America

Adult Hector's dolphins (Cephalorhynchus hectori) underwater near Akaroa, South Island, New Zealand, Pacific

A curious male leopard seal (Hydrurga leptonyx), underwater at Monroe Island, South Orkney Islands, Antarctica, Polar Regions

Adult humpback whales (Megaptera novaeangliae), bubble-net feeding near Morris Reef, Southeast Alaska, United States of America, North America

Adult humpback whales (Megaptera novaeangliae), bubble-net feeding in Sitka Sound, Southeast Alaska, United States of America, North America

Adult humpback whales (Megaptera novaeangliae), bubble-net feeding in Sitka Sound, Southeast Alaska, United States of America, North America

Adult Hector's dolphins (Cephalorhynchus hectori) underwater near Akaroa, South Island, New Zealand, Pacific

Panoramic of frozen lake Montespluga at dawn, Chiavenna Valley, Sondrio province, Valtellina, Lombardy, Italy, Europe

Adult Hector's dolphins (Cephalorhynchus hectori) underwater near Akaroa, South Island, New Zealand, Pacific

What is more beautiful? The harmonically formed tip of the Minke whaleÃŒs (Balaenoptera acutorostrata) snout or the water bubble along its lips? St. Lawrence estuary, Canada

Flightless cormorant (Nannopterum harrisi) demonstrating its amazing swimming ability on Isabella Island in the Galapagos Island Group, Ecuador

Galapagos sea lion (Zalophus wollebaeki) pup playing with its own exhalation underwater at Champion Islet near Floreana Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean

Blue-footed booby (Sula nebouxii) plunge-diving underwater in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

Humpback Whales (Megaptera novaeangliae) co-operatively bubble-net feeding near small whale watching boat in Stephen's Passage, Southeast Alaska, USA. Pacific Ocean.

Adult humpback whales (Megaptera novaeangliae) cooperatively bubble-net feeding in Freshwater Bay on Chichagof Island in Southeast Alaska, USA

Blue-footed booby (Sula nebouxii) plunge-diving underwater in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

Adult humpback whales (Megaptera novaeangliae) cooperatively bubble-net feeding in Freshwater Bay on Chichagof Island in Southeast Alaska, USA

Aerial view of adult humpback whales (Megaptera novaeangliae) preparing to dive in order to cooperatively "bubble-net" feed in Southeast Alaska, USA

Aerial view of adult humpback whales (Megaptera novaeangliae) preparing to dive in order to cooperatively "bubble-net" feed in Southeast Alaska, USA

Blue-footed booby (Sula nebouxii) plunge-diving underwater in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

Aerial view of adult humpback whales (Megaptera novaeangliae) cooperatively "bubble-net" feeding in Southeast Alaska, USA

Humpback Whales (Megaptera novaeangliae) co-operatively bubble-net feeding near the Safari Quest in Chatham Strait in Southeast Alaska, USA. Pacific Ocean.

Humpback Whales (Megaptera novaeangliae) cooperatively bubble-net feeding in Chatham Strait (upper jaw and baleen detail) in Southeast Alaska, USA. Pacific Ocean.

Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador

Blue-footed booby (Sula nebouxii) plunge-diving underwater in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

Humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in front of Mendenhall Glacier in Stephen's Passage, Southeast Alaska, USA. Pacific Ocean.

Adult humpback whales (Megaptera novaeangliae) cooperatively bubble-net feeding near Freshwater Bay on Chichagof Island in Southeast Alaska, USA

Adult humpback whales (Megaptera novaeangliae) cooperatively bubble-net feeding near Freshwater Bay on Chichagof Island in Southeast Alaska, USA

Adult Humpback Whales (Megaptera novaeangliae) cooperative bubble-net feeding for herring in Iyoukeen Bay, Chichagof Island, Southeast Alaska.

Adult humpback whales (Megaptera novaeangliae) cooperative bubble-net feeding in Iyoukeen Bay, southeast Alaska, USA.

Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador