Here's one Carla: Q. Why do ferrets only wag their tails while in enclosed spaces such as tubes, and usually just before pouncing? A. While hunting underground prey, ferret ancestors wagged their tails rapidly, hitting the sides of the tunnel and setting up a sonar like vibration. The echoes coming back would tell the ferret how far away the prey was for the final pounce. Linda Iroff Oberlin OH [Posted in FML issue 2949]