According to the daily mail (a newspaper in the UK) The answer, is the chicken. Researchers found that the formation of egg shells relies on a protein found only in a chicken's ovaries. Therefore the egg can only exsist if it has been inside the chicken itself. I personally thought it was evolution: A look-alike rooster and a look-alike hen mated and produced an egg, which mutated and hatched out the new form of chicken we have today. NEW CHALLENGE!!!!!!!!! Why did the chicken cross the road!? Oh my