Tim Fitzharris / Timber Wolf (Canis lupus) pair of pups, Montana

Jim Brandenburg / Timber Wolf (Canis lupus) pup in forest, Minnesota

Jim Brandenburg / Timber Wolf (Canis lupus) pup portrait, Minnesota

Jim Brandenburg / Timber Wolf (Canis lupus) track in snow, Minnesota

Thomas Mangelsen / Timber Wolf (Canis lupus) group and Common Raven (Corvus corax) group play in the snow, National Elk Refuge, Wyoming

Konrad Wothe / Timber Wolf (Canis lupus) standing over White-tailed Deer (Odocoileus virginianus) carcass, Colorado

Konrad Wothe / Timber Wolf (Canis lupus) running across dried grass in winter

Konrad Wothe / Timber Wolf (Canis lupus) portrait in winter

Sumio Harada / Gray Wolf (Canis lupus) member of the Druid Pack, feeding on elk carcass in Lamar Canyon, Yellowstone National Park, Wyoming

Gerry Ellis / Timber Wolf (Canis lupus) portrait of four month old pup, Oregon Zoo, Portland, Oregon

Konrad Wothe / Timber Wolf (Canis lupus) walking through forest, Colorado

Thomas Mangelsen / Timber Wolf (Canis lupus) group and Common Raven (Corvus corax) feed on Elk (Cervus elaphus) carcass, National Elk Refuge, Wyoming