One thing I do, since I don't like putting up with the guests, is build sanctuaries! You pick an animal or two, close tha zoo, get a sturdy fence from the zookeeper picks, fence off the entrance, and put all the animals needs in all around the zoo ( in a variety of places, of course), and then put the animals in! It's funner with multiple species, though. And you need to use a large map. Put in a reasonable amount of animals, though (Example: Don't put four animals on a large map. Eight to twelve would do of a smaller species) Place the number of animals in the zoo according to their size and how much space they need.