Tumble Weed

Tumble weed is unique. It grows all summer and is green and lush and full. Then at the end of its life it becomes a brown skeleton like structure . It spreads its seeds by breaking off from its base and then the wind blows it and it rolls along the prairie. It often gets caught in fences along its journey.
That is what happened to this one.

 I have seen piles of them, many feet deep along the fences.