Also, it takes so much time to build a nice, decorative wing of the zoo. Remember, happy people give a lot of money in donations and buy a lot of stuff!! I once had a zoo that made 20- 30 thousand dollars a month off of donations alone! One thing that can get tedious is keeping the animals happy, and building perfect animal exibits. It is very hard to make money if you have a large zoo however, unless you have happy people. It is also good for people who like to manage money, zoo rating, animal happiness, and guest happiness.