That hump isn't fat. It's a "snowplow."

That giant shoulder hump isn't a fat reserve. It's solid muscle that anchors the bison's enormous head, letting it sweep aside deep snow to reach the grass buried underneath. While most grazers go hungry in a hard winter, bison simply swing their heads side to side and plow down to the frozen prairie below — built, quite literally, around the job of feeding where nothing else can.

American bison (Bison bison)

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