Mark Carwardine / Hawaiian goose / Nene (Branta sandvicensis) looking down, Slimbridge, Gloucestershire, UK, Captive, native to Hawaii, USA, Vulnerable species, September

Shattil & Rozinski / Juvenile American dipper (Cinclus mexicanus) at stream, British Columbia, Canada, September

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) large buck emerging from forest at first snow

Tim Fitzharris / Timber Wolf (Canis lupus) portrait, North America

Konrad Wothe / Black-tailed Prairie Dog (Cynomys ludovicianus) alert pair, North America

Gerry Ellis / Bald Eagle (Haliaeetus leucocephalus) portrait, North America

Gerry Ellis / Snowy Owl (Nyctea scandiaca) camouflaged against snow, North America

Konrad Wothe / Bald Eagle (Haliaeetus leucocephalus) portrait, North America

Michael Quinton / Coyote (Canis latrans) portrait in snow, North America

Steven Kazlowski / Sea otter (Enhydra lutris) grooms itself in icy waters off Columbia Glacier in Prince William Sound, Chugach National Forest, Alaska, USA, May

Konrad Wothe / White-tailed Deer (Odocoileus virginianus) fawn standing in spring meadow, North America

Patricio Robles Gil / Dall's Sheep (Ovis dalli) ram portrait, North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) fawn standing in summer stream

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) big buck portrait North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) ten point buck in velvet

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck bedded in winter woods

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) ten point buck in summer field

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) big eight point buck in velvet, backlit in meadow during late summer

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) two alert bucks at forest edge

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) big buck in dawn field backlit with other buck in background

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) alert buck close-up portrait North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) doe in heat with large eight point buck in frosty field

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) fawn in tall grass, autumn

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) young male looking back in fall meadow

Shin Yoshino / Black-tailed Prairie Dog (Cynomys ludovicianus) group at burrow entrance, North America

Mitsuaki Iwago / Siberian Chipmunk (Tamias sibiricus) portrait, North America

Tim Fitzharris / Timber Wolf (Canis lupus) portrait in snow, North America

Jim Brandenburg / Timber Wolf (Canis lupus) pup looking back over its shoulder, North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) two year old buck with yearling spike buck in meadow

Mark Raycroft / Elk (Cervus elaphus) large bull standing alert in meadow with mountains behind

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) young male portrait North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) two alert does, summer

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) two does and a fawn, backlit, standing alert in dewy morning meadow at forest's edge

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) spotted fawn bedded down in meadow

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) large buck bedded down in fall forest

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) large buck standing alert among ferns at forest's edge

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) alert buck with antlers in velvet at forest edge

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) alert fawn in summer field

Shin Yoshino / Black-tailed Prairie Dog (Cynomys ludovicianus) group at burrow entrance, North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) alert fawn standing in tall, dry grass in late summer

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck standing alert among ferns at forest's edge

Sumio Harada / Coyote (Canis latrans) guarding carcass in snow, Rocky Mountains, North America

Sumio Harada / Coyote (Canis latrans) alert, standing in snow, Rocky Mountains, North America

Sumio Harada / White-tailed Deer (Odocoileus virginianus) buck, Rocky Mountains, North America

Sumio Harada / Short-tailed Weasel (Mustela erminea) in summer, North America

Tom Vezo / Great Horned Owl (Bubo virginianus) perching in tree, North America

Tom Vezo / Burrowing Owl (Athene cunicularia) on ground with lupine, North America

Gerry Ellis / Great Horned Owl (Bubo virginianus) portrait, front view, North America

Konrad Wothe / Black-tailed Prairie Dog (Cynomys ludovicianus) giving warning call to group members, North America

Konrad Wothe / Mountain Lion (Puma concolor) adult, North America

Konrad Wothe / Red Fox (Vulpes vulpes) kit on riverbank, North America

Konrad Wothe / Red Fox (Vulpes vulpes) two alert kits on riverbank, North America

Konrad Wothe / Red Fox (Vulpes vulpes) reflected in lake, North America

Konrad Wothe / Timber Wolf (Canis lupus) walking through forest, Pine County, Minnesota

Sumio Harada / Coyote (Canis latrans) portrait sitting in tall grass, Rocky Mountains, North America

Gerry Ellis / Black-tailed Prairie Dog (Cynomys ludovicianus) portrait, North America

Tim Fitzharris / Timber Wolf (Canis lupus) portrait of pair sitting in snow, North America

Gerry Ellis / Dall's Sheep (Ovis dalli) alert trio on rocks, North America

Thomas Mangelsen / Desert Bighorn Sheep (Ovis canadensis nelsoni) camouflaged against rocks, North America

Thomas Mangelsen / Curve-billed Thrasher (Toxostoma curvirostre), North America

Tim Fitzharris / Columbian Ground Squirrel (Spermophilus columbianus) trio, North America

Gerry Ellis / Timber Wolf (Canis lupus) juveniles, four months old, temperate North America

Gerry Ellis / Timber Wolf (Canis lupus) female, temperate North America

Gerry Ellis / Barred Owl (Strix varia) portrait, North America

Tim Fitzharris / Timber Wolf (Canis lupus) portrait, North America

Michael & Patricia Fogden / Antelope Jackrabbit (Lepus alleni) standing alert, Sonoran Desert, North America

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) on tree stump, Rocky Mountains, North America

Sumio Harada / Pronghorn Antelope (Antilocapra americana) standing in snow, North America

Sumio Harada / Pronghorn Antelope (Antilocapra americana) portrait, side view, North America

Gerry Ellis / Sea Otter (Enhydra lutris) portrait, Pacific coast, North America

Konrad Wothe / Coyote (Canis latrans) pup, North America

Konrad Wothe / Red Fox (Vulpes vulpes) alert kit at den entrance, North America

Konrad Wothe / Red Fox (Vulpes vulpes) alert kit at den entrance, North America

Tim Fitzharris / Timber Wolf (Canis lupus) portrait, North America

Tim Fitzharris / Mule Deer (Odocoileus hemionus) fawn, North America

Tim Fitzharris / Mountain Lion (Puma concolor) portrait, North America

Tim Fitzharris / Bighorn Sheep (Ovis canadensis) group standing along rocky shore, North America

Tim Fitzharris / Mountain Lion (Puma concolor) juvenile in snow, North America

Michael Quinton / Coyote (Canis latrans) standing in snow, North America

Shin Yoshino / Unita Ground Squirrel (Spermophilus armatus) group backlit, North America

Shin Yoshino / Eastern Fox Squirrel (Sciurus niger) standing on lawn, North America

Shin Yoshino / White-tailed Deer (Odocoileus virginianus) grazing in tall grass, North America

Tim Fitzharris / Coyote (Canis latrans) two pups in tall grass, North America

Mark Raycroft / Elk (Cervus elaphus) large bull looking over shoulder

Mark Raycroft / Coyote (Canis latrans) alert in field

Thomas Mangelsen / Common Snipe (Gallinago gallinago) standing on tree stump, North America

Konrad Wothe / Coyote (Canis latrans) alert pup at entrance of den, North America

Tim Fitzharris / Northern Cardinal (Cardinalis cardinalis) close-up, alert and perching on twig, North America