Brookfield Zoo is huge. I think it ranks as one of the larges zoos in the entire US! There's tons to see here and you can spend an entire day here just strolling the grounds and checking out their numerous exhibits. This zoo is also very geared towards getting and educational message out about safety, recycling, and animal care. Its a great place to take kids because there is really so much to learn and see here. They do charge addmission at this zoo, but I think it is a small price payed for the amount of zoo and the experience you get here. Make sure to check out the monkeys here. They really are the star attraction here!
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