アメリカ内務省のインスタグラム(usinterior) - 12月16日 04時07分

"All summer long, bison eat the cereal. In winter, they eat the box." As the snow flies in #Yellowstone, #bison work harder and harder to find food. They sweep their giant, wedge-shaped heads back and forth, pushing into the snow until they reach what's left of last summer's grass: an exercise that often leaves them malnourished come spring.
Want more photos? Follow @yellowstonenps (NPS photo by Neal Herbert).

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