The walnuts are falling in great numbers from the many black walnut trees (Juglans nigra) around my office building. I suppose it would be strange if they were falling from anywhere else. The ground under them is covered quite densely, in some places the ground is almost entirely covered with walnuts varying in color from bright chartreuse in the newly fallen fruit to almost black in those that have been on the ground a little while. There are a couple picnic tables along the edge of the woods and the squirrels seem to enjoy using those for their walnut meals. I did move these closer together but they were on the table, along with a bunch of smaller pieces.