According to Pi, a zookeeper will know he or she has created a healthy environment for the animals WHEN THE ANIMALS REPRODUCE.
For animals to reproduce and give birth to young ones, many things has to be in place, such as suitable partners, right environment, right food, etc. Animals naturally reproduce when the environment is favorable unto them. Thus, reproduction of animals in the zoo shows that the right environment has been created for the animals.
To learn to appreciate what they have
I did play for theater and I roughly remember the plot but Ichabod Crane was made fun of often and looked on by others as “weird”. He was a school teacher trying to impress a pretty woman in the town. He was very afraid although he acted tough. He was merely afraid of his own footsteps at times. I think mostly explaining his character is good because that it basically the beginning plot haha