Several shots from different angles of rats running up and down on ropes and shelves, in a simulated barnyard, to join a platform with bowl of food on it, rats eating from bowl. MCSs and HASs of rats swimming and getting up on a platform in middle of pool, in same simulated barnyard, looking for food, in last shot platform is full of biscuits. CSs and MCSs of rats running around in backyard and amongst tires.