Donald M. Jones / Wild Turkey (Meleagris gallopavo) males running, western Montana

Donald M. Jones / Wild Turkey (Meleagris gallopavo) male running, western Montana

Donald M. Jones / Wild Turkey (Meleagris gallopavo) male running, western Montana

Donald M. Jones / Pronghorn Antelope (Antilocapra americana) buck running on prairie, eastern Montana

Donald M. Jones / Pronghorn Antelope (Antilocapra americana) buck running, eastern Montana

Donald M. Jones / Mule Deer (Odocoileus hemionus) buck running, North America

Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull running, western Montana

Donald M. Jones / Harlequin Duck (Histrionicus histrionicus) male running on water, western Montana

Colin Monteath / Siberian Husky (Canis familiaris) running in sled team with Mike McDowell skiing alongside, Greenland

Colin Monteath / Siberian Husky (Canis familiaris) group running in sled team with Tore Stenseng skiing alongside, Greenland

Colin Monteath / Siberian Husky (Canis familiaris) group running in sled team with Tore Stenseng skiing alongside, Greenland

Suzi Eszterhas / Cheetah (Acinonyx jubatus) chasing male Thomson's Gazelle (Eudorcas thomsonii), Masai Mara National Reserve, Kenya

Suzi Eszterhas / Cheetah (Acinonyx jubatus) chasing male Thomson's Gazelle (Eudorcas thomsonii), Masai Mara National Reserve, Kenya

Theo Allofs / Bengal Tiger (Panthera tigris tigris) male chasing Sambar (Cervus unicolor) deer mother and young, Ranthambore National Park, India

Richard Du Toit / Nyala (Tragelaphus angasii) male running, summer, South Africa

Patricio Robles Gil / Wild Turkey (Meleagris gallopavo) pair of males running, Serranias del Burro, Coahuila, Mexico

Richard Du Toit / Greater Kudu (Tragelaphus strepsiceros) male running, Londolozi, Sabi Sands Private Game Reserve, South Africa

Konrad Wothe / Cowboy riding Domestic Horse (Equus caballus) is followed by two Dogs (Canis familiaris), Oregon

Konrad Wothe / Cowboy riding Domestic Horse (Equus caballus) throwing a lasso, Oregon

Konrad Wothe / Cowboy riding Domestic Horse (Equus caballus) through field, Oregon

Konrad Wothe / Cowboy riding a Domestic Horse (Equus caballus) beside pond with two dogs, Oregon

Konrad Wothe / Cowboys riding Domestic Horse (Equus caballus) group beside pond with dogs, Oregon

Konrad Wothe / Cowboys riding Domestic Horse (Equus caballus) group beside pond with dogs, Oregon

Konrad Wothe / Cowboy riding a Domestic Horse (Equus caballus) beside pond with two dogs, Oregon

Konrad Wothe / Cowboy riding a Domestic Horse (Equus caballus) beside pond with two dogs, Oregon

Konrad Wothe / Domestic Horse (Equus caballus) group herded by cowboy and cowgirl, Oregon

Konrad Wothe / Cowboys herding Domestic Horse (Equus caballus) group at dusk, Oregon

Konrad Wothe / Domestic Horse (Equus caballus) group herded by cowboy, Oregon

Konrad Wothe / Cowboys riding Domestic Horses (Equus caballus) with dogs (Canis familiaris) running beside pond, Oregon

Konrad Wothe / Domestic Cat (Felis catus) male running in snow, Germany

Konrad Wothe / Domestic Cat (Felis catus) male running in snow, Germany

Konrad Wothe / Domestic Cat (Felis catus) male running in snow, Germany

Konrad Wothe / Domestic Cat (Felis catus) in deep snow, Germany

Konrad Wothe / Domestic Cat (Felis catus) male jumping in snow, Germany

Konrad Wothe / Domestic Cat (Felis catus) male jumping in snow, Germany

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) big mature buck fleeing into cedars showing underside of white tail

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) mature buck fleeing into forest showing underside of white tail

Nick Garbutt / Male Bengal Tiger {Panthera tigris tigris} running and patrolling territory, Bandhavgarh National Park, Madhya Pradesh, India.

Mark Raycroft / German Shepherd (Canis familiaris) adult male running through snow

Winfried Wisniewski / African Lion (Panthera leo) male running, Africa

Richard Du Toit / Warthog (Phacochoerus africanus) male running, Chobe National Park, Botswana

Tim Fitzharris / African Lion (Panthera leo) male running, Kenya

Mark Moffett / Wind Scorpion (Galeodidae) runs on a treadmill under the watchful eye of biologist Kellar Autumn, Lewis and Clark College, Portland, Oregon

Sumio Harada / Mountain Goat (Oreamnos americanus) male running down snowy mountain slope, Glacier National Park, Montana

Pete Oxford / Domestic Cattle (Bos taurus) roped by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Chagra cowboy roping a calf in Paramo habitat at a hacienda during the annual cattle round-up, Andes Mountains, Ecuador

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) stallion running at sunset, southeast Oregon

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) group running, Bureau of Land Management wranglers round up surplus horses for adoption, Wyoming

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) chased by Bureau of Land Management wranglers who round up surplus horses for adoption, Wyoming

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) chased by Bureau of Land Management wranglers who round up surplus horses for adoption, Wyoming

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) stallion running in winter, Wyoming

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) stallion, running, curious and aggressive, on winter range, Wyoming

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) stallion running, summer, Pryor Mountain Wild Horse Range, Montana

Gerry Ellis / Common Cuscus (Phalanger orientalis) caught by hunting party for bush meat, tropical rainforest, southeastern slope, Mt Bosavi, Papua New Guinea

Flip de Nooyer / Ring-necked Pheasant (Phasianus colchicus) male running in pasture, Europe

Michael Quinton / Alaska Moose (Alces alces gigas) young bull charges young Timber Wolf (Canis lupus), Teklanika River, Denali National Park and Preserve, Alaska

Mark Jones / Vicuna (Vicugna vicugna) male chasing rival, Pampa Galeras National Reserve, Peruvian Andes, Peru

Tui De Roy / Vicuna (Vicugna vicugna) males chasing to establish dominance, Pampa Galeras National Reserve, Peruvian Andes, Peru

Tui De Roy / Vicuna (Vicugna vicugna) males chasing to establish dominance, Pampa Galeras National Reserve, Peruvian Andes, Peru

Tui De Roy / Vicuna (Vicugna vicugna) males chasing each other to establish dominance, Pampa Galeras National Reserve, Peruvian Andes, Peru

Tui De Roy / Vicuna (Vicugna vicugna) dominant male running to intimidate rival, Llulita, Apurimac, Peruvian Andes, Peru

Michio Hoshino / Caribou (Rangifer tarandus) male running, Alaska

Michio Hoshino / Alaska Moose (Alces alces gigas) male charging across tundra, Alaska

Juergen & Christine Sohns / Sable Antelope (Hippotragus niger) male running, Tswalu Game Reserve, South Africa

Martin Willis / Domestic Cattle (Bos taurus) being herded by cowboy, Australia

Cyril Ruoso / Przewalski's Horse (Equus ferus przewalskii) sub-adult males running along release enclosure, Gobi Desert, Mongolia

Donald M. Jones / White-tailed Deer (Odocoileus virginianus) buck running, Montana

Donald M. Jones / Elk (Cervus elaphus) bull running, Alberta, Canada

Sean Crane / African Wild Ass (Equus africanus) male chasing rival, Box Springs Mountain Reserve, California

Suzi Eszterhas / Kob (Kobus kob) male running, Queen Elizabeth National Park, Uganda

Debapratim Saha/ BIA / Red-crested Pochard (Netta rufina) male taking flight, West Bengal, India

Anup Shah / Hanuman Langur (Semnopithecus entellus) male running near temple, Hampi, Karnataka, India

Hiroya Minakuchi / Springbok (Antidorcas marsupialis) males in dominance chase, Etosha National Park, Namibia

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) twelve year old male, named Tom, running, Gombe National Park, Tanzania

Martin Willis / Imbabala (Tragelaphus sylvaticus) male crossing road, Caprivi Strip, Namibia

Heidi & Hans-Juergen Koch / Bactrian Camel (Camelus bactrianus) stallion running through flowering desert, Gobi Desert, Mongolia

Peter Mather / Caribou (Rangifer tarandus) bull, of the porcupine herd, running in winter near Dempster Highway, Yukon, Canada

Anup Shah / Leopard (Panthera pardus) male hunting Blue Wildebeest (Connochaetes taurinus) on riverbank, Mara River, Masai Mara, Kenya

Anup Shah / Leopard (Panthera pardus) male hunting Blue Wildebeest (Connochaetes taurinus) on riverbank, Mara River, Masai Mara, Kenya

Sebastian Kennerknecht / Cheetah (Acinonyx jubatus) twenty-one month old sub-adult siblings crossing road near tourists, Kafue National Park, Zambia

Ralph Martin/ BIA / Common Merganser (Mergus merganser) male taking flight, Baden-Wurttemberg, Germany

Tui De Roy / South American Sea Lion (Otaria flavescens) bull hunting Gentoo Penguin (Pygoscelis papua), Dunbar Island, Falkland Islands, sequence 4 of 8

Tui De Roy / South American Sea Lion (Otaria flavescens) bull hunting Gentoo Penguin (Pygoscelis papua), Dunbar Island, Falkland Islands, sequence 3 of 8

Tui De Roy / South American Sea Lion (Otaria flavescens) bull hunting Gentoo Penguin (Pygoscelis papua), Dunbar Island, Falkland Islands, sequence 2 of 8

Tui De Roy / South American Sea Lion (Otaria flavescens) bull hunting Gentoo Penguin (Pygoscelis papua), Dunbar Island, Falkland Islands, sequence 1 of 8

Suzi Eszterhas / Humpback Whale (Megaptera novaeangliae) male blowing bubbles as part of aggressive display during competitive heat run for female, Tonga

Suzi Eszterhas / Humpback Whale (Megaptera novaeangliae) male blowing bubbles as part of aggressive display during competitive heat run for female, Tonga

Suzi Eszterhas / Humpback Whale (Megaptera novaeangliae) male blowing bubbles as part of aggressive display during competitive heat run for female, Tonga

Cyril Ruoso / Namib Desert Horse (Equus caballus) dominant stallion chasing challenger, Namib-Naukluft National Park, Namibia

Cyril Ruoso / Namib Desert Horse (Equus caballus) stallion running, Namib-Naukluft National Park, Namibia

Yva Momatiuk & John Eastcott / Guanaco (Lama guanicoe) male chasing rival in spring, Torres del Paine National Park, Patagonia, Chile

Yva Momatiuk & John Eastcott / Guanaco (Lama guanicoe) sub-adult males chasing each other, Los Glaciares National Park, Patagonia, Argentina

Yva Momatiuk & John Eastcott / Guanaco (Lama guanicoe) sub-adult males chasing each other, Los Glaciares National Park, Patagonia, Argentina

Sebastian Kennerknecht / Mountain Lion (Puma concolor) six month old male cub running, Torres del Paine National Park, Patagonia, Chile

Donald M. Jones / White-tailed Deer (Odocoileus virginianus) buck running, central Montana