Winter is the time when red squirrels are most easily observed. Less wary than during breeding season, when they have young to protect, they are now out and about, focused on gathering food, eating food, and protecting food! You'll see sumac cones, crabapples, mushrooms, walnuts, etc. stashed in forks of trees, piled on the ground, piled in cavities (where a tree is big enough.... one large walnut tree in the Arboretum every year has a massive cache of walnuts about 10 feet above the ground in a cavity). Barry took this pretty photo.