Sergey Gorshkov / Tolbachik Volcano erupting, Kamchatka, Russia

Tim Fitzharris / Lesser Flamingo (Phoenicopterus minor) flock flying, Lake Magadi, Kenya

Tim Fitzharris / Lesser Flamingo (Phoenicopterus minor) flock flying, Lake Magadi, Kenya

Hiroya Minakuchi / Sea ice, Weddell Sea, Antarctic Peninsula, Antarctica

Matthias Breiter / Meltwater lakes on Hubbard Glacier, Wrangell-St. Elias National Park, Alaska

Ingo Arndt / Nordenskjold Glacier with Allardyce Range showing medial moraine and glacial foot, South Georgia Island

Nick Upton / Aerial view of a dense flock of Great Cormorants (Phalacrocorax carbo) resting on a sandbank at Scroby Sands along with a mixed species flock of gulls including Greater black-backed gulls (Larus marin...

Pete Oxford / Kaieteur Waterfall where the Potaro River runs into the Essequibo River, Kaieteur National Park, Guyana

Pete Oxford / Rainforest and Essequibo River, Iwokrama Rainforest Reserve, Guyana

Pete Oxford / Rainbow over rainforest and Kanuku Mountains, Upper Takutu-Upper Essequibo, Guyana

Pete Oxford / Rainforest and Kanuku Mountains, Upper Takutu-Upper Essequibo, Guyana

Pete Oxford / Road runnning through rainforest, Iwokrama Rainforest Reserve, Guyana

Pete Oxford / Rainforest, Iwokrama Rainforest Reserve, Guyana

Pete Oxford / Essequibo River, Iwokrama Rainforest Reserve, Guyana

Luciano Candisani / Sebastiao Gomes Reef, Caravelas, southern Bahia, Brazil

Sergey Gorshkov / Sand dunes, Namib Desert, Namibia

Richard Du Toit / Fire in dry season burning agricultural fields, Western Cape, South Africa

Richard Du Toit / Fire in dry season, Western Cape, South Africa

Wild Wonders of Europe / López / Aerial view of saltmarsh exposed at low tide, Baha de Cdiz Natural Park, Cdiz, Andalusia, Spain, March 2008

Chien Lee / Canopy of lowland mixed dipterocarp forest, Lambir Hills National Park, Borneo, Malaysia

Chien Lee / Canopy of lowland mixed dipterocarp forest, Lambir Hills National Park, Borneo, Malaysia

Wild Wonders of Europe / Carwardine / Photographer, Mark Carwardine, standing in front of plane used for aerial photography for Wild Wonders of Europe mission, Akureyri, Iceland, June 2009

Flip Nicklin / Blue Whale (Balaenoptera musculus) fatally injured in collision with ship and subsequently found by research vessel, Santa Barbara Channel, California

Flip Nicklin / Blue Whale (Balaenoptera musculus) surfacing, Santa Barbara Channel, California

Theo Allofs / Mokau Falls in rainforest, Te Urewera National Park, New Zealand

Ingrid Visser / Coral reefs and islands, Kimbe Bay, West New Britain Island, Papua New Guinea

Richard Du Toit / Southern Giraffe (Giraffa giraffa) four running across wetland, Okavango Delta, Botswana

Richard Du Toit / Burchell's Zebra (Equus burchellii) herd crossing pan during summer dry season, Makgadikgadi Salt Pans, Botswana

Richard Du Toit / African Lion (Panthera leo) females hunting Cape Buffalo (Syncerus caffer) herd, Okavango Delta, Botswana

Suzi Eszterhas / Blue Wildebeest (Connochaetes taurinus) crossing the Mara River during migration, Masai Mara National Reserve, Kenya

Richard Du Toit / Cape Buffalo (Syncerus caffer) herd, Okavango Delta, Botswana

Richard Du Toit / Gemsbok (Oryx gazella) running, Namib-Naukluft National Park, Namibia

Mark Moffett / Deforestation study plot, biological dynamics for forest fragments project near Manaus, Brazil

Jim Brandenburg / Sunset over Grand Canyon National Park, Arizona

Mitsuaki Iwago / Aerial view of atoll on the Great Barrier Reef, Australia

Tim Fitzharris / African Elephant (Loxodonta africana) parents and two calves with Cattle Egret (Bubulcus ibis) flock, Kenya

Mitsuaki Iwago / Humpback Whale (Megaptera novaeangliae) group bubble net feeding, Alaska

Jim Brandenburg / Aerial view of Namib Desert sand dunes, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) on sand dune, Namib Desert, Namibia

Jim Brandenburg / Aerial view of Namib Desert meeting Atlantic Ocean at the Skeleton Coast, Namibia

Jim Brandenburg / Landscape of sand dunes, Namib Desert, Namibia

Gerry Ellis / Soda and algae formations near shore of Lake Natron, Great Rift Valley, Tanzania

Gerry Ellis / African Elephant (Loxodonta africana) herd at watering hole, Tsavo National Park, Kenya

Pete Oxford / Aerial view of sand dunes, near Sossusvlei, Namibia

Tim Fitzharris / African Elephant (Loxodonta africana) parents and two calves with Cattle Egret (Bubulcus ibis) flock, Kenya

Jim Brandenburg / Gemsbok (Oryx gazella) on sand dune, Namib Desert, Namibia

Gerry Ellis / Star dune formations, Namib-Naukluft National Park, Namibia

Gerry Ellis / Aerial view of barchan dunes showing typical horns and downwind slip face, at approximately 32 degrees, Skeleton Coast National Park, Namibia

Gerry Ellis / Aerial view of star dune formations, Namib-Naukluft National Park, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) standing on dune, Namib Desert, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) trio running on sand dune, Namib Desert, Namibia

Michael & Patricia Fogden / Aerial view of sand dunes along the Skeleton Coast, Walvis Bay, Namibia

Konrad Wothe / Flight safari, Okavango Delta, Botswana

Konrad Wothe / Safari airplane flying over the flooded Okavango Delta, Botswana

Jim Brandenburg / Polar Bear (Ursus maritimus) walking across ice floes, Ellesmere Island, Nunavut, Canada

Flip Nicklin / Blue Whale (Balaenoptera musculus) surfacing, Santa Barbara Channel, California

Patricio Robles Gil / St. Elias Mountains, Kluane National Park, Canada

Patricio Robles Gil / Glacier, St. Elias Mountain, Kluane National Park, Canada

Patricio Robles Gil / Blue Whale (Balaenoptera musculus) aerial view of mother and calf swimming near the surface in the Gulf of California, Mexico

Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) trio surfacing, Shark Bay, Australia

Claus Meyer / Dawn in the Amazon forest with intense evaporation, Amazon ecosystem, Brazil

Claus Meyer / Anavilhanas archipelago in the middle of the Rio Negro River which is 24 kilometers wide at this point, Amazon ecosystem, Brazil

Gerry Ellis / Canouan Island, Grenadine Archipelago, Lesser Antilles, Caribbean

Gerry Ellis / Islands at southeast end of Lake Kutubu in highlands, Papua New Guinea

Gerry Ellis / Islands at southeast end of Lake Kutubu in highlands, Papua New Guinea

Michael & Patricia Fogden / Iguacu falls as seen from the Brazilian side, Brazil and Argentina border

Patricio Robles Gil / Guayalejo River flowing through cloud forest, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Patricio Robles Gil / Fog rolling over cloud forest, Altas Cumbres Protected Area, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Patricio Robles Gil / Aerial view of Tamul Waterfall (330 feet high) where Rio Gallinas cascades into the Rio Santa Maria river in the Huasteca Potosina region, Mexico

Gerry Ellis / Hurricane Bay, Virgin Islands National Park, Saint John Island, Virgin Islands, Caribbean

Claus Meyer / Aerial view of the Iguacu Falls, Brazil

Gerry Ellis / Rainforest logging activities near eastern boundary of the Kikori Delta, Papua New Guinea

Claus Meyer / Meandering river in forest, Amazon, Brazil

Gerry Ellis / Crown of emergent rainforest tree covered in epiphytes in montane tropical rainforest, Braulio Carrillo National Park, Costa Rica

Jim Brandenburg / Aerial view of converging glacier, Ellesmere Island, Nunavut, Canada

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

Hiroya Minakuchi / Blue Whale (Balaenoptera musculus) surfacing to breath, largest animal on earth, Sea Cortez, Baja California, Mexico

Gerry Ellis / Logging road and erosion in lowland tropical rainforest east of Aird River Delta, Kikori Basin, Papua New Guinea

Gerry Ellis / Aerial view of gulf coast region showing lowland tropical rainforest and winding rivers, Kikori Delta, Papua New Guinea

Tim Fitzharris / Winter forest, British Columbia, Canada

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

Jim Brandenburg / Alluvial fan at mouth of glacial stream, Canadian Rocky Mountains, Alberta, Canada

Konrad Wothe / Pechora River valley hills covered with virgin forest, Pechora-Ilych Biosphere Reserve, Ural Mountains, Russia

Jim Brandenburg / Aerial view of Grand Prismatic Pool, Yellowstone National Park, Wyoming

Michio Hoshino / Caribou (Rangifer tarandus) herd migrating across tundra, Arctic National Wildlife Refuge, Alaska

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

Michio Hoshino / Caribou (Rangifer tarandus) herd migrating in summer, Arctic National Wildlife Refuge, Alaska

Jim Brandenburg / Polar Bear (Ursus maritimus) running over icefield during spring thaw, Ellesmere Island, Nunavut, Canada

Michio Hoshino / Caribou (Rangifer tarandus) herd migrating across tundra, Arctic National Wildlife Refuge, Alaska

Jim Brandenburg / Polar Bear (Ursus maritimus) walking on ice floe, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Farmlands encroaching on prairie potholes, North Dakota

Tui De Roy / Bottlenose Dolphin (Tursiops truncatus) leaping playfully through calm inter-island seas, Hood Island, Galapagos Islands, Ecuador

Flip Nicklin / Blue Whale (Balaenoptera musculus) with researcher Bruce Mate on boat attempting to attach satellite tag, Santa Barbara, California

Flip Nicklin / Blue Whale (Balaenoptera musculus) with researcher Bruce Mate on boat attempting to attach satellite tag, Santa Barbara, California

Flip Nicklin / Blue Whale (Balaenoptera musculus) mother and calf, Santa Barbara Channel, California

Flip Nicklin / Blue Whale (Balaenoptera musculus) mother and calf, Santa Barbara Channel, California