If you're under 25, you get a discount. The entry fee isn't too high, but it isn't cheap either. That being said, it's well worth it. You get really close to the animals and some of the exhibits really integrate you into the enclosure. It's well worth a visit. Their rainforest exhibit is the best I've been to, but it is ~100 Fahrenheit, so beware if your going in winter. Your camera will steam up for a while (try using the hand dryer looking unit outfront before going in to adjust it yo the temperature difference) and you'll want to take off your jacket.