Donald M. Jones / Common Loon (Gavia immer) stretching wings, Troy, Montana

Kevin Schafer / Amazon River Dolphin (Inia geoffrensis) pair swimming in Ariau River, tributary of Rio Negro, Amazonia, Brazil

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

Jan Vermeer / Emperor Penguin (Aptenodytes forsteri) chicks, Riiser-Larsen Ice Shelf, Antarctica

Michio Hoshino / Grizzly Bear (Ursus arctos horribilis) shaking off water after a bath, Alaska

Richard Du Toit / Springbok (Antidorcas marsupialis) grazing under tree, Kalahari Gemsbok Park, South Africa

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

Mitsuaki Iwago / African Lion (Panthera leo) mother with cub at dawn, Serengeti National Park, Tanzania

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

Mitsuaki Iwago / African Lion (Panthera leo) cubs playing, Serengeti National Park, Tanzania

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

Tim Fitzharris / Sunrise over Granadier Range, Molas Pass, Weminuche Wilderness, Colorado

Tim Fitzharris / Bald Cypress (Taxodium distichum) grove in freshwater swamp at dawn, Lake Fausse Pointe, Louisiana

Tim Fitzharris / Black-tailed Jackrabbit (Lepus californicus) western North America

Norbert Wu / California Sea Lion (Zalophus californianus) playing in shallow water, Channel Islands, California

Jim Brandenburg / Inuits dog sledding in midnight sun, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / American Bison (Bison bison) herd grazing on prairie at sunset, South Dakota

Flip Nicklin / Giant Kelp (Macrocystis pyrifera) forest, Channel Islands National Park, California

Jim Brandenburg / Arctic Wolf (Canis lupus) portrait, Ellesmere Island, Nunavut, Canada

Mitsuhiko Imamori / Honeypot Ant (Camponotus inflatus) repletes hanging from ceiling of larder, engorged with nectar they will regurgitate on demand to other workers, central Australia

Jim Brandenburg / Coniferous forest backlit at dawn, Minnesota

Michio Hoshino / Grizzly Bear (Ursus arctos horribilis) mother and cubs in autumn grass, Alaska

Jim Brandenburg / Arctic Wolf (Canis lupus) trio at sunset, Ellesmere Island, Nunavut, Canada

Michio Hoshino / Caribou (Rangifer tarandus) group crossing through river during migration, Alaska

Michio Hoshino / Polar Bear (Ursus maritimus) mother and two cubs, Churchill, Manitoba, Canada

Mark Moffett / Carpenter Ant (Camponotus schmtzi) on tendril of host Pitcher Plant (Nepenthes bicalcarata), Borneo, Malaysia

Mitsuhiko Imamori / Honeypot Ant (Camponotus inflatus) repletes hanging from ceiling of larder, engorged with nectar they will regurgitate on demand to other workers, central Australia

Richard Du Toit / Vervet Monkey (Chlorocebus aethiops) jumping, Limpopo, South Africa

Richard Du Toit / African Darter (Anhinga rufa), Rietvlei Nature Reserve, Gauteng, South Africa

Tim Fitzharris / Seastacks silhouetted at sunset, Ruby Beach, Olympic National Park, Washington

Albert Lleal / Brazilian Waterweed (Egeria densa) leaf showing chloroplasts and cell walls

Albert Lleal / Soft Hornwort (Ceratophyllum submersum) leaf showing chloroplasts and cell walls

Ingo Arndt / Reticulated Glass Frog (Hyalinobatrachium valerioi) male camouflaged on leaf guarding egg clutch, Costa Rica

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) male at sunrise, Lake Clark National Park, Alaska

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) male at sunrise, Lake Clark National Park, Alaska

Jim Brandenburg / Merganser (Mergus sp) duck female and chicks in the rain, Olivia Pond, North America

Jim Brandenburg / Mont Saint-Michel and row of trees, Normandy, France

Tom Vezo / Mittens at sunrise, Monument Valley Navajo Tribal Park, Arizona

Jim Brandenburg / Tombelaine Island, Normandy, France

Jim Brandenburg / Standing stones at sunrise, Carnac, Brittany, France

Tui De Roy / Grant's Gazelle (Nanger granti) male, Ol Pejeta Conservancy, Kenya

Tui De Roy / Grant's Gazelle (Nanger granti) herd at sunset, Ol Pejeta Conservancy, Kenya

Tui De Roy / Cheetah (Acinonyx jubatus) in grassland, Ol Pejeta Conservancy, Kenya

Tom Vezo / Great Egret (Ardea alba) displaying during courtship in breeding plumage, Florida

Richard Herrmann / Giant Kelp (Macrocystis pyrifera) blades floating at surface, Cortez Bank, California

Hiroya Minakuchi / Sunrise over rainforest, Malaysia

Hiroya Minakuchi / Ant (Crematogaster sp), Malaysia

Hiroya Minakuchi / Leaves with holes, Danum Valley, Malaysia

Konrad Wothe / Emperor Penguin (Aptenodytes forsteri) adult pair with chicks walking at sunset, Weddell Sea, Antarctica

Sebastian Kennerknecht / Dromedary (Camelus dromedarius) camel silhouetted on beach at sunrise, Hawf Protected Area, Yemen

Konrad Wothe / Baobab (Adansonia digitata) tree at sunset, Ruaha National Park, Tanzania

Konrad Wothe / Snail (Zonitidae) on dew covered grass, Bavaria, Germany

Piotr Naskrecki / Morning fog over rainforest, New Britain, Papua New Guinea

Donald M. Jones / Elk (Cervus elaphus) bull breathing, National Bison Range, Moise, Montana

Donald M. Jones / Common Loon (Gavia immer) taking flight, Troy, Montana

Hiroya Minakuchi / Japanese Maple (Acer palmatum) leaves in fall colors, Kyoto, Japan

Hiroya Minakuchi / Japanese Maple (Acer palmatum) leaves in fall colors, Kyoto, Japan

Jim Brandenburg / Blazing Star (Liatris pycnostachya) flowers in prairie, Aldo Leopold Memorial Preserve, Wisconsin

Theo Allofs / Hippopotamus (Hippopotamus amphibius) running in water, Moremi Game Reserve, Okavango Delta, Botswana

Tim Fitzharris / Proboscis Monkey (Nasalis larvatus) female calling, Sabah, Borneo, Malaysia

Tim Fitzharris / Proboscis Monkey (Nasalis larvatus) female, Sabah, Borneo, Malaysia

Jim Brandenburg / Common Loon (Gavia immer) spreading wings, Superior National Forest, Minnesota

Jim Brandenburg / European Hare (Lepus europaeus) jumping through wetland, Netherlands

Hiroya Minakuchi / Reticulated Glass Frog (Hyalinobatrachium valerioi) camouflaged on leaf, Costa Rica

Hiroya Minakuchi / Leaves in cloud forest, Arenal Volcano, Costa Rica

Christian Ziegler / Leaf-nosed Bat (Phyllostomidae) flight muscles and blood vessels in the wing membrane, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Christian Ziegler / Leaf-nosed Bat (Phyllostomidae) wing showing veins, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Donald M. Jones / Mountain Goat (Oreamnos americanus), Glacier National Park, Montana

Donald M. Jones / Mountain Goat (Oreamnos americanus), Glacier National Park, Montana

Kevin Schafer / Licuala Fan Palm (Licuala ramsayi) leaves, Licuala State Forest, Mission Beach, Queensland, Australia

Kevin Schafer / Licuala Fan Palm (Licuala ramsayi) leaf, Licuala State Forest, Mission Beach, Queensland, Australia

Tui De Roy / Reticulated Giraffe (Giraffa reticulata) pair, El Karama Ranch, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) pair, Tumaren Ranch, Kenya

Konrad Wothe / Feather Grass (Stipa pennata) field, Bulgaria

Konrad Wothe / European Bee-eater (Merops apiaster) with insect prey, Bulgaria

Tim Fitzharris / Coconut Palm (Cocos nucifera) trees at dusk on Pamilacan Island, Philippines

Tim Fitzharris / Coconut Palm (Cocos nucifera) trees at sunset near Dimiao, Bohol Island, Philippines

Tim Fitzharris / Coconut Palm (Cocos nucifera) at sunset near Dimiao, Bohol Island, Philippines

Tim Fitzharris / Coconut Palm (Cocos nucifera) at sunset near Dimiao, Bohol Island, Philippines

Tim Fitzharris / Coconut Palm (Cocos nucifera) trees at sunset at Bikini Beach, Panglao Island, Philippines

Konrad Wothe / Licuala Fan Palm (Licuala ramsayi) fronds, Mission Beach, North Queensland, Queensland, Australia

Konrad Wothe / Licuala Fan Palm (Licuala ramsayi) frond and leaf shadow, Daintree National Park, North Queensland, Queensland, Australia

Konrad Wothe / Licuala Fan Palm (Licuala ramsayi) fronds, Daintree National Park, North Queensland, Queensland, Australia

Murray Cooper / Sunrays coming through the mist, Yasuni National Park, Ecuador

Murray Cooper / Arum (Araceae) leaves, Ecuador

Scott Leslie / Orb-weaver Spider (Araneidae) on web, Nova Scotia, Canada

Winfried Wisniewski / Herring Gull (Larus argentatus) flying and calling, Norway

Winfried Wisniewski / Sandhill Crane (Grus canadensis) drinking at dusk, Bosque del Apache National Wildlife Refuge, New Mexico

Winfried Wisniewski / Sandhill Crane (Grus canadensis) flock flying, Bosque del Apache National Wildlife Refuge, New Mexico

Winfried Wisniewski / Sandhill Crane (Grus canadensis) trio flying, Bosque del Apache National Wildlife Refuge, New Mexico

Mitsuaki Iwago / Japanese Macaque (Macaca fuscata) climbing in tree, Jigokudani, Japan

Mitsuaki Iwago / Orangutan (Pongo pygmaeus) in tree, Borneo, Malaysia

Sebastian Kennerknecht / Barley (Hordeum sp) field, South Dakota

Sergey Gorshkov / Leopard (Panthera pardus) walking at night, Botswana

Sergey Gorshkov / Leopard (Panthera pardus) in tree at night fall, Botswana