To find out the qualifications for your state, contact the North American Association of Wildlife Officers . The official job web site for the National Parks Service . Being a veterinarian would be wonderful for you, but it is a long road education-wise. It can take at least 6 to 8 years of post secondary education. There are other careers that work with animals.
Stunt work is very much like the acting field.
The work can be difficult to get when you're starting out like any actor. Each one of them is a career in and of themselves. You are right in that these are difficult fields to break into, however, if you become skilled at what you do and are persistent in your job searches, you can make a living. You should also check into your art department at your community colleges for classes in photography and film studies. You can try your hand at screenwriting in most creative writing classes.