Kevin Schafer / Bumblebee (Bombus sp) on flower, Juneau, Alaska

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

Chase Dekker / African Lion (Panthera leo) male, Masai Mara, Kenya

Chase Dekker / African Lion (Panthera leo) cub, Masai Mara, Kenya

Chase Dekker / Lesser Flamingo (Phoenicopterus minor) wading, Amboseli National Park, Kenya

Chase Dekker / Lesser Flamingo (Phoenicopterus minor) pair fighting, Amboseli National Park, Kenya

Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry playing in tree, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Winfried Wisniewski / White Stork (Ciconia ciconia) on nest, Extremadura, Spain

Jami Tarris / Walrus (Odobenus rosmarus) bull, Spitsbergen, Svalbard, Norway

Juergen & Christine Sohns / African Lion (Panthera leo) six week old cubs, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / African Lion (Panthera leo) six week old cub, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / African Lion (Panthera leo) male drinking at waterhole, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / African Lion (Panthera leo) juvenile male, Mountain Zebra National Park, South Africa

Juergen & Christine Sohns / Meerkat (Suricata suricatta) pregnant female and juveniles on alert, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / Meerkat (Suricata suricatta) pair on alert, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / Meerkat (Suricata suricatta) pair on alert, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / Meerkat (Suricata suricatta) pair on alert, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / Meerkat (Suricata suricatta) on alert, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / Meerkat (Suricata suricatta) on alert, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / Meerkat (Suricata suricatta) on alert, Tswalu Game Reserve, South Africa

Anup Shah / Olive Baboon (Papio anubis) male with three month old young, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) fourteen year old sub-adult male, named Fundi, making submissive facial gesture, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) twenty-five year old female, named Nasa, Gombe National Park, Tanzania

Heike Odermatt / Walrus (Odobenus rosmarus) on ice floe, Hinlopen Strait, Svalbard, Norway

Heike Odermatt / Brunnich's Guillemot (Uria lomvia) nesting colony on cliff, Alkefjellet, Hinlopen Strait, Svalbard, Norway

Suzi Eszterhas / Golden Lion Tamarin (Leontopithecus rosalia), Atlantic Forest, Brazil

Suzi Eszterhas / Golden Lion Tamarin (Leontopithecus rosalia), Atlantic Forest, Brazil

Sven Zacek / Ural owl (Strix uralensis) perched in tree sleeping, viewed through a fence, Estonia.

Gary Bell/ Oceanwide / Tropical island, Keeling Islands, Australia

Gary Bell/ Oceanwide / Granite rocks with lichen and Milky Way, Bicheno, Tasmania, Australia

Gary Bell/ Oceanwide / Green Sea Turtle (Chelonia mydas), Heron Island, Great Barrier Reef, Queensland, Australia

Gary Bell/ Oceanwide / Piling with sponges, tunicates, and ascidians, Yorke Peninsula, South Australia, Australia

Gary Bell/ Oceanwide / Portuguese Man Of War (Physalia physalis) jellyfish, Coffs Harbor, Solitary Islands Marine Park, New South Wales, Australia

Gary Bell/ Oceanwide / Scarlet Cleaner Shrimp (Lysmata amboinensis) cleaning mouth of Tomato Grouper (Cephalopholis sonnerati), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Scarlet Cleaner Shrimp (Lysmata amboinensis) cleaning mouth of Tomato Grouper (Cephalopholis sonnerati), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Whitemouth Moray (Gymnothorax meleagris) being cleaned by Cleaner Wrasse (Labroides sp) juvenile, Christmas Island, Australia

Gary Bell/ Oceanwide / Scarlet Cleaner Shrimp (Lysmata amboinensis) cleaning Yellow-edged Moray (Gymnothorax flavimarginatus), Tulamben, Bali, Indonesia

Gary Bell/ Oceanwide / Variegated Jawfish (Opistognathus solorensis) male brooding eggs in mouth, Anilao, Philippines

Gary Bell/ Oceanwide / Variegated Jawfish (Opistognathus solorensis) male brooding eggs in mouth, Anilao, Philippines

Mark Raycroft / Pronghorn Antelope (Antilocapra americana) running in winter, North America

Mark Raycroft / Grizzly Bear (Ursus arctos horribilis), North America

Mark Raycroft / Grizzly Bear (Ursus arctos horribilis), North America

Mark Raycroft / Moose (Alces alces) bull browsing, North America

Jeff Foott / Purple Owl's Clover (Castilleja exserta) and Goldfield (Lasthenia californica) flowers, super bloom, Carrizo Plain National Monument, California

Jeff Foott / California Poppy (Eschscholzia californica) and Goldfield (Lasthenia californica) flowers,super bloom, Antelope Valley, California

Jeff Foott / Marching Men formation, Arches National Park, Utah

Jeff Foott / Double Arch seen through Cove Arch, Arches National Park, Utah

Jeff Foott / Turret Arch in winter, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Double O Arch, Arches National Park, Utah

Jeff Foott / Turret Arch and the Milky Way, Arches National Park, Utah

Jeff Foott / Mule-ears (Wyethia amplexicaulis) flowers at the The Organ, Arches National Park, Utah

Jeff Foott / Marching Men sandstone formation, Arches National Park, Utah

Jeff Foott / Paintbrush (Castilleja sp) flowers, Arches National Park, Utah

Jeff Foott / Sandstone rock formations, La Sal Mountains, Arches National Park, Utah

Suzi Eszterhas / African Elephant (Loxodonta africana) calf drinking at waterhole, Mashatu Game Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) one-year-old cub in tree, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) one-year-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) four-month-old cub in tree, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) female, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus), Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) six-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) six-week-old cub nuzzling mother, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) five-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) five-week-old cub playing with mother's tail, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) mother and five-week-old cub, Jao Reserve, Botswana

David Pattyn / Golden eagle (Aquila chrysaetos) in flight in front of a vertical rocky mountain side, Gran Paradiso National Park, Aosta Valley, Italy, May

Alan Murphy/ BIA / Curve-billed Thrasher (Toxostoma curvirostre), Texas

Alan Murphy/ BIA / Golden-fronted Woodpecker (Melanerpes aurifrons) female, Texas

Alan Murphy/ BIA / Clay-colored Thrush (Turdus grayi) feeding on berries, Texas

Alan Murphy/ BIA / Altamira Oriole (Icterus gularis), Texas

Alan Murphy/ BIA / Harris' Hawk (Parabuteo unicinctus) flying, Texas

Alan Murphy/ BIA / Northern Caracara (Caracara cheriway) pair fighting, Texas

Alan Murphy/ BIA / Magnolia Warbler (Setophaga magnolia) male, Texas

Alan Murphy/ BIA / Pine Grosbeak (Pinicola enucleator) male, Alaska

Willi Rolfes/ BIA / European Wolf (Canis lupus), Lower Saxony, Germany

Daniel Brockner/ BIA / Crimson-rumped Toucanet (Aulacorhynchus haematopygus), Mindo, Ecuador

Willi Rolfes/ BIA / Alpine Marmot (Marmota marmota) parent feeding with begging young, Hohe Tauern National Park, Austria

Marion Vollborn/ BIA / Polar Bear (Ursus maritimus), Svalbard, Norway

Marion Vollborn/ BIA / Polar Bear (Ursus maritimus), Svalbard, Norway

Marion Vollborn/ BIA / Leopard (Panthera pardus) male stalking, Sabi-sands Game Reserve, South Africa

Walter Soestbergen/ BIA / Spotted Nutcracker (Nucifraga caryocatactes) fluffing, Gelderland, Netherlands

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) in tree, Anja Park, Madagascar

Cyril Ruoso / Przewalski's Horse (Equus ferus przewalskii) herd, Gobi Desert, Mongolia

Shane P. White / Coconut Crab (Birgus latro) on palm tree, Espiritu Santo, Vanuatu

Shane P. White / Coconut Palm (Cocos nucifera) tree on beach, Port Olry, Espiritu Santo, Vanuatu

Shane P. White / Coconut Palm (Cocos nucifera) tree on coast, Aimbuei Bay, Aore Island, Vanuatu

Gary Bell/ Oceanwide / Intermediate Cardinalfish (Cheilodipterus intermedius) male incubating eggs in mouth, Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Intermediate Cardinalfish (Cheilodipterus intermedius) male incubating eggs in mouth, Great Barrier Reef, Australia

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) juvenile breaching, Maui, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) calf, Maui, Hawaii

Jeff Foott / Sunwapta Falls, Sunwapta River, Jasper National Park, Alberta, Canada

Jeff Foott / Waterfall after autumn snowfall, Tangle Creek Falls, Jasper National Park, Alberta, Canada

Jeff Foott / Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, Wyoming

Jeff Foott / Fumaroles, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, Wyoming

Jeff Foott / Indian Rhubarb (Darmera peltata) growing on rock in river, Cascade Creek, Yosemite National Park, California

Jeff Foott / Mountain Dogwood (Cornus nuttallii) flowering, Merced River, Yosemite National Park, California