It's challenging to take on something else that is not you and make it very real and have others be able to associate with it. It's wonderful to provoke thought.
Most exotic animals are not particularly interested in people, which makes it hard to provoke them. Human-rearing gets them used to and sometimes imprinted on humans, which makes them potentially dangerous.
I want all my books to provoke some kind of response in the reader, to make them think something or feel something or both, and for that to become a part of them and work into their own lives.