

A caribou bull feeds on fall vegetation in Denali National Park, Alaska, in this undated photo. Steven J. Kazlowski/Newscom/FILE
An Alaskan brown bear sow and cub cross a stream in Glacier Bay National Park, Alaska, in this undated photo. Howie Garber/Newscom/FILE
A polar bear sow rests with her cubs on the pack ice in the Beaufort Sea in northern Alaska in this undated photo. Steve Amstrup/U.S. Fish and Wildlife Service/AP/FILE
A gray wolf trots down a gravel road in Denali National Park, Alaska, in this undated photo. Newscom/FILE
A bull moose munches on a mountain ash tree in Anchorage, Alaska, in 2009. Bill Roth/Anchorage Daily News/AP/FILE
A bald eagle flies on the Kenai Peninsula of Alaska in this undated photo. Tom Vezo/Newscom/FILE
A hoary marmot suns itself on a rock in Kenai Fjords National Park, Alaska, in this undated photo. Steven J. Kazlowski/Newscom/FILE
A young male walrus rests on the beach in Barrow, Alaska, in 2007. Noe Texeira/North Slope Borough/AP
Gary Penner frees his female goshawk to pursue hares during a hunt near his home in Sterling, Alaska, on Oct. 20. M. Scott Moon, Peninsula Clarion/AP
One of Cindy Gallea's leader dogs howls with anticipation as she gets ready to leave the Takotna, Alaska, checkpoint during the Iditarod Trail Sled Dog Race on Mar. 11. Bob Hallinen/Anchorage Daily News/AP
US Census Bureau Director Robert Groves arrives in the remote Inupiat Eskimo village of Noorvik, Alaska, in a dogsled driven by Noorvik resident Brian Coffin on Jan. 25. Groves came to the village to formally launch the nation's 2010 count of America's residents. Carolyn Kaster/AP
Curtains of green northern lights glow above the Brooks Range over a camping tent in this undated photo. Newscom/FILE
Andrew Elliasen of the US Forest Service preps a section of the Perseverance Trail in Ketchikan, Alaska, for gravel on June 24. Two popular trails in the Ketchikan area got makeovers this summer, with one project providing more hiking opportunities inside city limits and the other rehabilitating a well-used path through the Tongass National Forest. Niki Steffan/US Forest Service/Ketchikan Daily News/AP
A solitary kayaker floats amid the blue-tinged icebergs below Pedersen Glacier in Kenai Fjords National Park, Alaska, in 2009. Tom Uhlenbrock/St. Louis Post-Dispatch/MCT/Newscom/FILE
A Promech Air turbine otter floatplane takes off over south Tongass Narrows in Ketchikan, Alaska, on Oct. 27. Hall Anderson/Ketchikan Daily News/AP