DULUTH, MN (KDAL) - The Lake Superior Zoo is holding its largest fundraiser of the year over the next two Saturdays. "Boo at the Zoo" draws thousands of little "trick or treaters" for a safe and fun experience at the zoo. The animals get in on the fun too with special treats. Tickets are nine dollars in advance at the zoo or area Little Stores and ten dollars at the door. Boo at the Zoo runs from 10 a-m to 4 p-m on October 12th and 19th.