I would go with squirrels. I've seen them in action. They would work in tandem. One would climb the stalk and use it's weight to pull it down, while the other would then nimble on the bent stalk and then drag it away.
I had 8 plant go that way one year. I thought it was a deer, until I saw the 9th and last one being worked on.
Mighty smart fellers if you ask me.
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