The 'invention' of football goes back as far as the 11th century in England. During those days the football was an inflated bladder, usually from a pig. This is where the term 'pigskin' came from.
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Football are sometimes called a "pigskin," which makes people think footballs might be made out of pigs. But nope! The NFL's official footballs are made of premium cowhide leather.
Footballs were actually made out of a pig's bladder. They used pig's bladders because they were durable, easy to inflate, accessible and relatively round in shape.