An egg is a round or oval body laid by the female
of any number of different species, consisting of
an ovum surrounded by layers of membranes and an
outer casing, which acts to nourish and protect
a developing embryo and its nutrient reserves. Most
edible eggs, including bird eggs and turtle eggs,
consist of a protective, oval eggshell, the albumen
(egg white), the vitellus (egg yolk), and various
thin membranes...