Purchase one admission ticket and get the second of equal or lesser value free. Free ticket must be redeemed by March 25, 2018. NO EXCEPTIONS. Prices and operating schedule are subject to change without notice. Not valid for special or evening events and cannot be combined with any other promotions. Tickets are non-refundable and non-transferable. Offer ends March 25, 2018. To purchase your discount tickets, go to tickets.detroitzoo.org (Store Name: hemingway)