The first benefit of being an animal caretaker is that you get to work with and take care of, well, animals! It's usually a specific animal that you're assigned to or a few animals from a zoo or shelter.
Another is if you work for a shelter or for a family who is too busy, you often exercise with the animal(s) by taking them for walks or playing with them, which can be a good workout for yourself!
Lastly, you also get to tell people how to take care of their animal (if you're at a shelter or a home). This helps ensure that animals are being well taken care of, and that makes the world just a little bit better.