Some morphs, like spiders, and womas can have a neurological effect known as head wobble. Some cases are a lot more noticeable than others, and some show no signs of it whatsoever. I have a spider and she has a slight wobble, and she does on occasion move her head in odd angles, and sometimes looks like she's tying herself into a knot. But she eats just fine and doesn't seem to effect her. In my opinion, it just adds to these morphs personalities and adds to their overall quirkiness.