The zoo provides the animals the comfortable and safe living conditions that can not be found in other places.
If the animals get hurt or ill, certain people will take care of them to prevent futher danger caused by the diseases.
Good opportunities for the people in the city especially those children who don't have the chance to set foot in the wild world
Watching the animals in the zoo may give the parents a good chance to teach their children to love the animals and the world
The parents can get the children know more about the animals in the zoo by watching listening even smelling instead of just looking at the dull pictures in the books.
The zoo is a good place to know the rules in the wild world. We can be much more closer to the nature.
By doing this we may be given deeper impression on the great power of the nature. To know how precious the animals are , and how to love them and live with them to keep the balance in the nature.