These hickory nuts can tell us that there are two different kinds of squirrels in the area. The hickory nuts on the right were eaten by Grey Squirrels, who literally tear the nuts apart to get at the insides. The hickory nuts on the left were eaten by Flying Squirrels. They gnaw a round hole in one end of the nut. Since Flying Squirrels are nocturnal, this is often the only sign that they are around. Although we rarely see them, in many areas, Flying Squirrels outnumber Grey Squirrels.