Chase Dekker / Humpback Whale (Megaptera novaeangliae) breaching at sunset, Monterey Bay, California

Gary Bell/ Oceanwide / Coastal rock arch at sunset, Bermagui, New South Wales, Australia

Ralph Pace / Olive Ridley Sea Turtle (Lepidochelys olivacea) females coming ashore to nest during arribada, Playa de Escobilla Sanctuary, Oaxaca, Mexico

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) tail slapping at sunrise, Lahaina, Maui, Hawaii

Chase Dekker / Brown Bear (Ursus arctos) in river, Katmai National Park, Alaska

Hiroya Minakuchi / Southern Right Whale (Eubalaena australis) sailing at sunset, Peninsula Valdez, Argentina

Shane P. White / Leatherback Sea Turtle (Dermochelys coriacea) females laying eggs on beach at sunset, Trinidad and Tobago, Caribbean

Andrew Peacock / Acacia (Acacia sp) trees at sunset, northern Kenya

Sebastian Kennerknecht / South African Giraffe (Giraffa giraffa giraffa) juvenile at sunset, Greater Makalali Private Game Reserve, South Africa

Paul Bertner / Rainforest at sunrise, Sani Lodge, Ecuador

Vincent Grafhorst / Salt flat, Lake Asale, Danakil Depression, Ethiopia

Tim Fitzharris / Sunrise over Half Dome, Yosemite Valley, Yosemite National Park, California

Tim Fitzharris / Sunrise over Half Dome, Yosemite Valley, Yosemite National Park, California

Thomas Marent / Greater Flamingo (Phoenicopterus ruber) flock flying, Los Flamencos Sanctuary, Guajira Peninsula, Colombia

Benjamin Olson / Skim ice in negative thirty degree fahrenheit at sunrise, Lake Superior, Grand Portage National Monument, Minnesota

Ralf Kistowski/ BIA / Common Crane (Grus grus) group flying at sunset, Mecklenburg-Vorpommern, Germany

Thomas Krumenacker/ BIA / Common Crane (Grus grus) flock at sunrise, Brandenburg, Germany

Tim Fitzharris / Cathedral Rock at sunset, Coconino National Forest, Arizona

Tim Fitzharris / Snow Goose (Chen caerulescens) flock in pond at sunrise, Bosque del Apache National Wildlife Refuge, New Mexico

Tim Fitzharris / Clouds at sunset, Black Canyon of the Gunnison National Park, Colorado

Colin Monteath/ Hedgehog House / Mountains reflected in lake at sunset, Lake Matheson, Mount Tasman and Mount Cook, Westland National Park, South Island, New Zealand

David Williams/ BIA / Common Starling (Sturnus vulgaris) flock flying over lake, Wales, United Kingdom

Matthias Breiter / Sun setting behind mountains, Lynn Canal, Juneau, Alaska

Matthias Breiter / Peaks rising above fog, Neva Strait, Sitka, Alaska

Tim Fitzharris / Deciduous forest in fall, Ozark-Saint Francis National Forest, Arkansas

Tim Fitzharris / Deciduous forest in fall, Ozark-Saint Francis National Forest, Arkansas

Colin Monteath/ Hedgehog House / Sand dune at sunrise, Simpson Desert, Northern Territory, Australia

Sean Crane / White Rhinoceros (Ceratotherium simum) pair at sunrise, Lewa Wildlife Conservancy, Kenya

Sean Crane / Horseshoe Crab (Limulus polyphemus) group spawning at high tide at sunset, Cape May, New Jersey

Sean Crane / Horseshoe Crab (Limulus polyphemus) group spawning at high tide at sunset, Cape May, New Jersey

Alan Murphy / Common Loon (Gavia immer) pair on lake at sunset, British Columbia, Canada

Colin Monteath / Coastal cliffs, Tunnel Beach, Otago Peninsula, Otago, New Zealand

Donald M. Jones / Snow Goose (Chen caerulescens) flock flying at sunrise, central New Mexico

Adri de Visser / Zebra (Equus quagga) pair at sunrise, Masai Mara, Kenya

Kevin Schafer / Emperor Penguin (Aptenodytes forsteri) tobogganing on sea ice at sunset, Weddell Sea, Antarctica

Ingo Arndt / Sunrise at Iguacu Falls, largest waterfalls in the world, Iguacu National Park, Brazil

Tim Fitzharris / El Arco, Cabo San Lucas, Baja California Mexico

Ingo Arndt / Olive Ridley Sea Turtle (Lepidochelys olivacea) hatchlings emerging from nest and making their way to the sea at sunrise, Ostional Beach, Costa Rica

Tim Fitzharris / Ruby Beach, Olympic National Park, Washington

Diane McAllister / The snow at Horsetail Falls' begins to melt in mid-February, enabling the falls to resume once again. The clear sky and low sun angle ignite the rock wall during sundown. Yosemite National Park, Calif...

Vincent Grafhorst / Thunder storm with lightning bolts at sunset over Kalahari, Khutse Game Reserve, Botswana

Vincent Grafhorst / Sunset over plains, Khutse Game Reserve, Botswana

Rob Brown / Sunset on beach, Kahurangi National Park, New Zealand

Albert Lleal / Clouds and full moon, Spain

Colin Monteath / Ice boulders on Ridley Beach, Cape Adare, Ross Sea, Antarctica

Vincent Grafhorst / Southern Giraffe (Giraffa giraffa) silhouetted against the setting sun, Lethiau Valley, Central Kalahari Game Reserve, Botswana

Konrad Wothe / Camargue Horse (Equus caballus) group running at sunset, Camargue, France

Thomas Marent / Cascades of the Iguacu Falls, the world's largest waterfalls, Iguacu National Park, Argentina

Grant Dixon / Wind cloud over Mount Everest seen from Sagarmatha National Park, Nepal

Tim Fitzharris / Sunset over Polihale Beach, Kauai, Hawaii

Piotr Naskrecki / African Savannah Mantid (Polyspilota aeruginosa) clinging to stick at sunset, Guinea, West Africa

Colin Monteath / Sunset from sand dunes above Mason Bay Beach, Rakiura National Park, Stewart Island, New Zealand

Tim Fitzharris / Sunset at Shark's Cove, Oahu, Hawaii

Tim Fitzharris / The Mittens and Merrick Butte at sunrise, Monument Valley, Arizona

Tim Fitzharris / Sunset over Leo Carillo State Beach, Malibu, California

Tim Fitzharris / Enderts Beach at sunset, Redwood National Park, California

Tim Fitzharris / Clouds and sunset reflected in stream, Hellroaring Plateau, Montana

Michael Quinton / Trumpeter Swan (Cygnus buccinator) pair on lake at sunset, North America

Tim Fitzharris / Crashing surf on rocks at sunset, Point Piedras Blancas, California

Tim Fitzharris / Sunrise as seen from Toroweap Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Full moon over the Grand Canyon at sunset as seen from Pima Point, Grand Canyon National Park, Arizona

Tim Fitzharris / Surf crashing on rocks at Keoneloa Bay, Kauai, Hawaii

Jim Brandenburg / Sunset over Grand Canyon National Park, Arizona

Tim Fitzharris / View from Grandview Point looking over sandstone canyons of Monument Basin in the Island in the Sky section of the park, Canyonlands National Park, Utah

Jim Brandenburg / Ice along the shore of Burntside Lake at sunset, Superior National Forest, Minnesota

Tui De Roy / Salvin's Albatross (Thalassarche salvini) returning en masse to crowded nesting colony at sunset, Proclamation Island, Bounty Islands, New Zealand

Tui De Roy / Salvin's Albatross (Thalassarche salvini) returning to crowded nesting colony at sunset, Proclamation Island, Bounty Islands, New Zealand

Gerry Ellis / Whistling Thorn (Acacia drepanolobium) tree over savannah, Masai Mara National Reserve, Kenya

Gerry Ellis / Dromedary (Camelus dromedarius) trio, domestic camels with Bedouins at sunset, Oasis Dakhia, Great Sand Sea, Sahara Desert, Egypt

Gerry Ellis / Dromedary (Camelus dromedarius) trio with Bedouins at sunset, Oasis Dakhia, Great Sand Sea, Sahara Desert, Egypt

Mitsuaki Iwago / African Lion (Panthera leo) female stalking Blue Wildebeest (Connochaetes taurinus) herd, Serengeti National Park, Tanzania

Michael & Patricia Fogden / Quiver Tree (Aloe dichotoma) at dusk, Kokerboom Reserve, Keetmanshoop, Namibia

Gerry Ellis / Whistling Thorn (Acacia drepanolobium) and moon, Amboseli National Park, Kenya

Mitsuaki Iwago / Whistling Thorn (Acacia drepanolobium) tree on savannah at sunset, Serengeti

Gerry Ellis / Burchell's Zebra (Equus burchellii) herd migrating through approaching storm, Masai Mara National Reserve, Kenya

Gerry Ellis / Umbrella Thorn (Acacia tortilis) trees at sunrise on savannah, Masai Mara, Kenya

Gerry Ellis / Sunset and storm clouds over waterhole, Kwando River flood plain, Linyanti Swamp, Okavango Delta, Botswana

Jim Brandenburg / African Elephant (Loxodonta africana) taking a dust bath, Etosha National Park, Namibia

Tim Fitzharris / Absaroka Range reflected in lake, Yellowstone National Park, Wyoming

Bob Barbour / Surfer known as 'Wingnut, ' Costa Rica

Bob Barbour / 1940 Ford Deluxe Woodie owned by Howard Benfield

Bob Barbour / Waves and beachscape, Baja California, Mexico

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

Gerry Ellis / Baobab (Adansonia digitata) tree silhouetted at sunset, Tanzania

Thomas Mangelsen / Sunset over Antler Creek, Yellowstone National Park, Wyoming

Thomas Mangelsen / White Ibis (Eudocimus albus) trio feeding at sunset, Ding Darling National Wildlife Refuge, Sanibel Island, Florida

Thomas Mangelsen / Polar Bear (Ursus maritimus) walking on ice at sunset, Churchill, Manitoba, Canada

Thomas Mangelsen / Clouds over Yellowstone River, Hayden Valley, Yellowstone National Park, Wyoming

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) cubs silhouetted against water at sunrise, Katmai National Park, Alaska

Colin Monteath / Mountaineer enjoying the view of Mt Everest and the Himalayan Mountains at sunset from Gokyo Ri, Khumbu, Nepal

Tim Fitzharris / Grand Teton Range and cloudy sky at Schwabacher Landing, reflected in the water, Grand Teton National Park, Wyoming

Konrad Wothe / Bottlenose Dolphin (Tursiops truncatus) pair leaping at sunrise, Honduras

Gerry Ellis / Mosquito Cove at dusk, Antigua, Caribbean

Tim Fitzharris / Lenticular clouds over Mt Dana, Mt Gibbs and Mammoth Peak reflected in flooded Tuolumne Meadows, Yosemite National Park, California

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) mare and foal silhouetted against evening sky during summer, Montana

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) family band grazing under evening sky, Pryor Mountain Wild Horse Range, Montana