Details for Crows feed on an elk carcass
Crows feed on an elk carcass in the Madison River that was killed by wolves the night before.
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WEST YELLOWSTONE - Everything must adapt to survive a Yellowstone National Park winter.
The bison did it millennia ago when they evolved huge heads and shoulder muscles to plow snow off the grass. Randy Roberson did it in 2003, when the National Park Service changed the rules for winter visitor travel.