Donald M. Jones / Mountain Goat (Oreamnos americanus) kids nuzzling, western Montana

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) mother with 4 month old cub, Katmai National Park, Alaska

Shin Yoshino / Black-tailed Prairie Dog (Cynomys ludovicianus) pair touching noses for identification, Colorado

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) pair of spring cubs, Denali National Park and Preserve, Alaska

Tui De Roy / Black-footed Albatross (Phoebastria nigripes) pair bonding, Midway Atoll, Hawaii

Tui De Roy / Black-footed Albatross (Phoebastria nigripes) pair bonding, Midway Atoll, Hawaii

Michio Hoshino / Grizzly Bear (Ursus arctos horribilis) mother and cub, Alaska

Jim Brandenburg / Black-tailed Prairie Dog (Cynomys ludovicianus) pair nuzzling to communicate, South Dakota

Tui De Roy / Black-footed Albatross (Phoebastria nigripes) courtship dance, Midway Atoll, Hawaii

Michio Hoshino / Alaska Moose (Alces alces gigas) pair courting, Alaska

Michio Hoshino / Alaska Moose (Alces alces gigas) mother nuzzling newborn calf, Alaska

Tim Fitzharris / Timber Wolf (Canis lupus) trio playing in snow, Montana