Not nuts...but stoned

I was checking out mosses and lichens along an ancient wood boundary bank this afternoon. There are lots of old trees dotted along the bank - beech, hornbeam, oak, field maple - many of them contorted into shapes that show they were part of a laid hedge many years ago. Each time I came to a cherry tree with a hollowed-out cavity at the base of the trunk I found great piles of discarded cherry stones. Each one had a tell-tale tiny neat hole, showing that wood mice had stocked up for winter eating the nutritious kernels inside the stones.