Jobs that help people/animals?

Hi! So I would like a job that helps people, animals, the world. I also want to have an important job. I was thinking along the lines of animal cruelty investigator, K9 officer, FBI Special Agent, etc. I am very experienced with animals, especially exotics (spiders, snakes, rodents, lizards, birds.) I am also very intelligent, and currently take math 3 grades ahead of my peers. I really want to help change lives and save lives. Any ideas?