They must be moving a lot of "product". I counted 12 pass almost directly overhead single file a year or so ago. They were flying just above the treetops and I not only heard but actually felt the whop, whop, whop from their blades as they cruised by. Odd that.
Nothing to worry about...(?)
Yeah well, I'm keep my eyes on 'em just the same.
We use fed land now. It’s all good.