The frosty face is a result of the bison moving massive amounts of snow with their large face and head to find the grass below. This guy is pushing the snow into the river.
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From Bison in Yellowstone Winter 2017
Portrait of a bison.
This fella looks pretty healthy and will most likely survive the winter. Many don't.
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Up Close and Personal
This fella was just across the road pushing the snow around with his face looking for lunch.
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A herd of bison forage deep in the snow for grass.
From Yellowstone in Winter
Shoveling through the shoulder deep snow for a patch of old grass below.
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The deep snow shows the harsh winters these animals face.
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Spring in Teton
A young bison calf stays close to mama.
Wolves and bears are the greatest threats to the calves or older bison.