I am still learning my ways around this site and saw your posting. I've read and experienced that those animals that you are very fond of as children are usually your spirit animal. Since we are more psychically open as children, we can sense them around us and they become like a fascination.
One of the best ways to find out what your spirit animal is, is to meditate on it. But if you don't think you would get a clear answer through a meditation; ask your spirit animal to make it self known to you in your waking life. Keep your eyes and ears open to signs and omen about a certain animal, and see where that gets you.
I have actually taught classes on how to find your spirit animal, as well as how to bring animal energies into your personal practice to help gain their "medicines" (particular qualities that you can call on like calling on Bear for strength.)
I hope this information was helpful.