In the last three years I've sent about 280 squirrels to the big walnut tree in the sky and haven't seen a tree rat for close to two weeks. Yesterday evening my wife asked me "What's that on the front lawn? I looked out the window and it's a ground hog and it was there again this morning, along with two more in the back yard. They aren't full grown so I think they were born this year. Time to put the .22 away and get out the .22 mag. You don't suppose the squirrels have called in reinforcements, do you?