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Avalanche debris on roadway
Avalanche debris on roadway
Avalanche debris on roadway
Avalanche debris on roadway

Road plows begin removing wet slab avalanche debris on Going to the Sun Road in Glacier National Park, 2009.

Road plows begin removing wet slab avalanche debris on Going to the Sun Road in Glacier National Park, 2009.

Avalanche path
Avalanche path
Avalanche path
Avalanche path

Regular avalanche activity keeps this path clear of trees. Snowy peaks of Glacier National Park in the background.

Regular avalanche activity keeps this path clear of trees. Snowy peaks of Glacier National Park in the background.

Avalanche debris and skier
Avalanche debris and skier
Avalanche debris and skier
Avalanche debris and skier

Debris from Red Rock Avalanche covers the road and is piled high along the banks of the river as a skier make his way along the road, 04/06/2009

Debris from Red Rock Avalanche covers the road and is piled high along the banks of the river as a skier make his way along the road, 04/06/2009

Bison herd feeding in the snow as seen from a tractor
Bison being fed on the National Elk Refuge_Full Size
Bison being fed on the National Elk Refuge_Full Size
Bison being fed on the National Elk Refuge_Full Size

Winter supplemental feeding of bison on the National Elk Refuge, just outside of Jackson, Wyoming.

Grizzly bear and cubs in Yellowstone National Park
Grizzly bear and cubs in Yellowstone National Park
Grizzly bear and cubs in Yellowstone National Park
Grizzly bear and cubs in Yellowstone National Park

A female grizzly bear with her three-year-old offspring on a snow-covered field in Yellowstone National Park. Image taken in April 2008. (USGS image, Steve Ard) 

A female grizzly bear with her three-year-old offspring on a snow-covered field in Yellowstone National Park. Image taken in April 2008. (USGS image, Steve Ard) 

Bison standing in the snow
Bison being fed on the National Elk Refuge
Bison being fed on the National Elk Refuge
Bison being fed on the National Elk Refuge

Supplemental feeding of bison on the National Elk Refuge, Wyoming in February 2008.

Bison standing in the snow
Bison being fed on the National Elk Refuge
Bison being fed on the National Elk Refuge
Bison being fed on the National Elk Refuge

Supplemental feeding of bison on the National Elk Refuge, Wyoming in February 2008.

Elk and bison standing in the snow
Elk and bison being fed on the National Elk Refuge
Elk and bison being fed on the National Elk Refuge
Elk and bison being fed on the National Elk Refuge

Elk and bison being fed on the National Elk Refuge, Wyoming. Grand Teton and Grand Teton National Park are in the background.

Aerial view of the National Elk Refuge  with Inset Map of Montana, Idaho, and Wyoming
Aerial view of the National Elk Refuge & Inset Map
Aerial view of the National Elk Refuge & Inset Map
Aerial view of the National Elk Refuge & Inset Map

Aerial view of the National Elk Refuge (left) and the town of Jackson, Wyoming (right) with inset map of study area including the National Elk Refuge and areas around the refuge of winter elk habitat.

Aerial view of the National Elk Refuge (left) and the town of Jackson, Wyoming (right) with inset map of study area including the National Elk Refuge and areas around the refuge of winter elk habitat.

Aerial view of the National Elk Refuge
Aerial view of the National Elk Refuge
Aerial view of the National Elk Refuge
Aerial view of the National Elk Refuge

Aerial view of the National Elk Refuge (left) and the town of Jackson, Wyoming (right) in 2007.

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