Ok Yesterday I went to Gather Eggs and i looked in the nest box I had 15 eggs so i picked them up and put them in my Egg Basket, As i started to walk away i Noticed A Very Small Brown Egg THe Size of a Quail Egg..... Is my Hen a freak?? What Causes The Different Egg Sizes. My Parents Thought i was playing a joke on them until we Cracked it. There was a lil bitty Yolk.