Under "Animals" it says that there are 33 habitats available. I am only showing about 22 on my screen. I keep adding service buliding and I never see any more animals coming up for purchase. I have also looked around on other zoo's and I see the same animals as I have almost.

What are these other 10 animals? And how many service buildings do I have to buy to get more options? I have about 15 buildings now not counting attractions. Please advise.