Konrad Wothe / Common Porcupine (Erethizon dorsatum), North America

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

Konrad Wothe / Mountain Lion (Puma concolor) leaping across stream, North America

Konrad Wothe / Eastern Chipmunk (Tamias striatus) on snag, North America

Flip Nicklin / Orca (Orcinus orca) portrait, North America

Tom Vezo / Lynx in Montana, USA. Captive animal

Michael Durham / Coho Salmon (Oncorhynchus kisutch) in their ocean-going 'silver' state, North America

Tim Fitzharris / Raccoon (Procyon lotor) in the forest, North America

ZSSD / Julia Butterfly (Dryas iulia) on flower, North America

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

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

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

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

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

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

ZSSD / Desert Bighorn Sheep (Ovis canadensis nelsoni) kid running, native to North America

ZSSD / North American River Otter (Lontra canadensis) pair, North America

Tom Vezo / Puma (Mountain lion) (Felis concolor). Montana, USA

ZSSD / Cornsnake (Elaphe guttata) with two heads, native to North America

Konrad Wothe / Virginia Opossum (Didelphis virginiana) young in mother's pouch, will nurse for three months before emerging, North America

Konrad Wothe / Virginia Opossum (Didelphis virginiana) young in mother's pouch, will nurse for three months before emerging, North America

Konrad Wothe / Virginia Opossum (Didelphis virginiana) female portrait in tree, North America

Konrad Wothe / Virginia Opossum (Didelphis virginiana) female hanging in tree by prehensile tail, North America

Konrad Wothe / Virginia Opossum (Didelphis virginiana) female in tree, North America

Konrad Wothe / Common Porcupine (Erethizon dorsatum) portrait in tree, North America

Konrad Wothe / Common Porcupine (Erethizon dorsatum) detail of quills, North America

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

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

Konrad Wothe / North American River Otter (Lontra canadensis) swimming underwater, North America

Konrad Wothe / Eastern Chipmunk (Tamias striatus) on snag, North America

Konrad Wothe / Red Fox (Vulpes vulpes) and Cross Fox meeting, an example of color variations within a species, North America

Gerry Ellis / Mountain Lion (Puma concolor) lounging on rocks, North America

Gerry Ellis / Mountain Lion (Puma concolor) standing on log at water's edge, North America

Norbert Wu / Domestic Pig (Sus scrofa domesticus) portrait, captive animal, North America

Tim Fitzharris / Mountain Lion (Puma concolor) kitten with speckled coat, North America

Flip Nicklin / Orca (Orcinus orca) portrait, North America

Flip Nicklin / Moray Eel (Gymnothorax sp) pair, North America

Juergen Freund / Tourists watch West Indian manatee {Trichechus manatus} in marine aquarium, USA, FOR EDITORIAL USE ONLY

Tom Vezo / Lynx (Felis lynx) in Montana, USA. C

Tom Vezo / Virginia opossum, Montana, USA (Didelphis virginiana)

Tom Vezo / Black bear {Ursus americanus} Montana USA