Eggs, the content of the hard-shelled reproductive body produced by a bird, considered as food.While the primary role of the egg obviously is to reproduce the species, most eggs laid by domestic fowl, except those specifically set aside for hatching, are not fertilized but are sold mainly for human consumption. Eggs produced in quantity come from chickens, ducks, geese, turkeys, guinea fowl, pigeons, pheasants, and quail.