The swaying of the head in albinos is a lot of times because they have really poor vision and this may help them see better.
Swaying in dark eyed rats can mean the same thing also. Swaying can help the rat figure out how faw an object is. The images of an object move across a rats retina when it sways it's head, so objects that are closer will move faster than an object that is much farther away. I believe this is called motion parallax.
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