Cropped this one closer to show more detail of the black squirrel's front paws, holding the horse-chestnut.

They turn the chestnuts around until they can get a good grip with their teeth, on a softer area of the nut, - and when they have a hold on it with their teeth, they run off and hide the nut someplace, to dig up later to eat, if food gets scarce. They are cute to watch.