Not Worth It
I worked at a zoo, in Fort Worth, Texas, which is number five in the USA. They're admission is only $12 for adults (13+) (2 & under are free, sr. are $9 ) has 16 permanent exhibits, 8 different attractions, houses more than 7,000 native and exotic animals and is open until November. While the Fort Wayne Childrens Zoo only has 1,500 animals, 5 attractions and only stays open until October 11th. And at the outrageous price of $13.50 (14+) (1 & under are free, sr. are $10.50) , it really seems like this zoo is taking advantage of its visitors, especially for being a non-profit organization (same as the fort worth zoo, who does more for cheaper.) I think you should re-evaluate your prices and be more considerate of how your they affect your visitors, in comparison to better zoos.