Bull moose forages in the willows
Bighorn sheep grazes in Yellowstone National Park's Lamar Valley
Black bear cub emerges from its winter den in Yellowstone National Park
Black bear cub emerges from its winter den to eat snow in Yellowstone National Park
Coyote mousing in the snow in Yellowstone National Park
Herd of bison climb a hil in a line in Yellowstone National Park
Bald eagles and ravens fight over a coyote carcass in Yellowstone National Park
Pronghorn resting in Gardiner, Montana
Pronghorn bucks grazing in Gardiner, Montana
Pronghorn in Gardiner, Montana
Frosty bison resting in Yellowstone National Park
Frosty bison approaches in Yellowstone National Park
Wolves howl while a bison looks on warily in Yellowstone National Park
Pack of wolves walks by a herd of bison in Yellowstone National Park
Bison and geyser steam in Yellowstone National Park
Opal Pool in Yellowstone's Midway Geyser Basin
Turquoise Pool in Yellowstone's Midway Geyser Basin
Yellowstone's Red Spouter mudpot is like a gurgling orange monster
Coyotes scuffle in the snow in Yellowstone National Park
Bighorn sheep ram on a rocky cliff in Yellowstone National Park
Bighorn sheep ram climbs a rocky cliff in Yellowstone National Park
Frosty cottonwood tree in Yellowstone's Lamar Valley
