I watched this very industrious little red squirrel harvesting walnuts today. He would run along the branches of the tall walnut tree, at top speed, stopping frequently to cut loose walnuts at various points. These would fall with a terrific thud to the ground below. Every so often, he'd select one and race down the tree with it where he'd proceed to bury it in the ground, or in some cases, just cover it with leaves, as far as I could tell. Then back up the tree and a repeat performance. Occasionally, he'd stop and scold me but it was half-hearted. He was far too busy working!