Somebody has wedged these seeds into the defiles of a shagbark hickory and whacked into them.
I suspect the White-breasted Nuthatch, a species in ample evidence here this winter. They’re seen and heard on every walk.
Anyone care to venture the identity of these seeds? They aren’t hickory. Both the White-breasted and Red-breasted will often harvest a seed from, say, a conifer, and then take it strong limbs to a broadleaf tree to chisel into it. This dollar coin is just over an 1″ in diameter.
Another bird seen and heard a lot this winter is the Tufted Titmouse.
This one is going full Blue Jay on an acorn.
Actually, Blue Jays will swallow smaller acorns whole. Whereas this tufted crowd just wants to break in.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
The very common titmice will hammer on peanuts in my Ozark forest.