The Brookfield Zoo is the best zoo around (even better than Lincoln park). It is a little bit pricey with admission and parking so a family pass is the best way to go. The children's secition of the zoo is wonderful. You can spend the whole day just in that area letting your kids paint their faces or take care of stuffed animals like vets. The zoo has every kind of animal of course and the apes are especially cute since several of them have babies right now.
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