At first, you will start with an empty field, with an entrance, some paths and a trash can. People: Depending on your population, people will come to the zoo, and give you money. You will also find them donating and littering. You can even find them with a dog (click on a dog to get money.) Be warned though: they can be dyed PINK! If they are pink, use water. Remember this: dyed people will not donate or litter, their dogs will not give money, or even worse, they will take your $20.
Zoo Tycoon [pink people]