Squirrel with Acorn

The oak tree in my parents' backyard is dropping acorns at an alarming rate; not to mention how much it hurts when they fall on you.  However, the little squirrels peel of the green skin and eat the nut inside; discarding the remains and moving on to the next one.

PS:  This picture was taken through their patio door because of the pelting acorns falling.