Animal Behaviorist at the Zoo
This is an interesting fellow who has spent a lot of time watching behavior of animals to analyze their thinking and emotions. He also has a book out which I have not read. So, if you like animals and believe they are similar to us, this person has the experience to document it. I am not too sure how many people are in this "hands-on" field or endeavor.
animal lovers will love this article from the New York Times