Mentioned by Red Tricycle
Best Museums for Chicago’s Curious Kids
"The Polar Play Zone is designed with littles in mind, which means kids have the run in the penguin play place, submarine and touch tanks with real starfish and stingrays. Visit the Amazon Rising and Wild Reef exhibits, see an aquatic show with dolphins, ask questions during an animal chat and watch a 4-D movie. Also, do not miss seeing the live diving and feeding at the Caribbean Reef."