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All fish swimming in schools have one eye on each side of their head, giving them very good eyesight. Enabling them to see things happening both over, under, behind and in front of them. The eye of a fish is particularly sensible for movement. In addition, they keep in touch with each other by a sense no other animal or human has : the sixth sense of the herring is the ability to ignore the sounds of life that occur in their midst, while fully engaged with feeling the shockwaves from the movement around them.