You will deliver babies, save endangered species, cure sick and injured animals, and develop relationships with creatures that many people don't understand or are scared of. It's glorious. You are also the liaison between man and beast. Every time you teach a person to respect and appreciate new wildlife, you are making the world better.
Also, you might have to save someone who falls into the lion's den or gets too close to the Polar Bears. That will score some serious glory points for you.