because most cows have a double skull and when the Indians had bows before guns to kill a bull cow you had to hit it is the eye and the new settlers brought gun so there was no need to hit them in the eye any longer but for target shooting they seen the skill to hit it so the called the middle and smallest target a bulls eye
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A common target for English longbow yeomen was the white skull of a bull, and the greatest skill could be illustrated by getting a "bull's eye"