Well to find a spirit animal, you must first know what one is! With that said, a spirit animal is: a spirit of a particular animal species.
Some spirit animals can be: Badger, Cow, Cardinal, Butterfly, wolf, dog, cat, Lizard, bear.Just to name a few.
For me, i think mine is a crow. I see it in my dreams, places i go, ect.
Several ways can be: meditation, dreams, coming across it, often. Having gut feelings, or even keywords that symbolize it.