A young bear will lie on back and play with his feet and toes by the hour,while a young puppy can have a great game with only a dry bone,or by chasing his shadow on the wall. Rabbit come out in the evening on the sand hills to play hide-and-seek with their young ,and squirrels never weary of this universal game. I know a young fox that used to come from an adjacent woods every evening to play with a young fox terrier. They became great friends and were often seen in the woods together.