I received the following info:
Knoxville Zoo's Kids Club is off and running! Every newsletter includes: an animal spotlight of a zoo animal and one of their keepers, puzzles, games, promotions and more.
You can also take advantage of the Kids Club Card. This is a frequent visitor's card. Just pick one up at the Membership Booth on your next visit. We will stamp it for you after each visit. Once it is full, you will receive a special prize!