We took DD at 22 months and she loves animals. Most people just miss the whole point that AK is actually a ZOO there are animal exhibits everywhere. They are very natural looking and almost everyone just rushes by on their way to the rides. WOW they are missing SO much. AK is fantastic. We plan to spend the whole day next trip just enjoying the animal exhibits. That and the Safari. We are not big show people but we really enjoyed the Flights of Wonder. We saw some African Acrobats too.
If all you want is rides, skip AK. But AK wasn't built to be about rides. You need to slow down, relax and take it all in. In my opinion, that is what a toddlers world is ALL about and AK is perfect for my animal loving toddler! I highly recommend it for yours too. And really it works out ok that most people don't notice the animals, because you pretty much have the exhibits all to yourself, unlike a regular zoo where you have to deal with crowds!