That need can make itself known with some special tattoos, in less than common places. It means we have taken the idea of these alterations so to heart that we will carry them always. It speaks loudly, because its a permanent commitment to an image, or expression. You cannot really take it back. So any tattoo is a declarative remark; a pronounced one. And such an perpetual statement changes the bearer for life, since, regardless of how they change as a person within themselves, the presence of the mark they chose will always resonate to them, and to any observers.
When we want to get closer to the spiritual we can subject ourselves to a good deal, we will paint, scar, pierce, and otherwise morph ourselves, if it will get us to any perceived nearness to whatever we see as divine. In fact, the act of placing oneself onto this pathway, often painful in the extreme, is considered of itself the door to divine association.
Our need to get closer to our animal part is just as profound, and sometimes we mask ourselves, or dress in hides, or even fake fur, in order to take the qualities of the animal we wish to emulate onto ourselves. We become, in the process, more than human. By backtracking to our more essential natures, we also move forward, and away from normative humanity.
Regardless of the deep seated reasons, which we often don't even know ourselves, we have this need to make ourselves different, and special. We want to insure that others know, when dealing with us, that we are meant to be taken into account, not brushed aside. We want, if not to be taken seriously, to be taken as important.