I have 5 Khaki Campbell hen ducks who are just beginning to lay. There have been 2 extra large/long eggs this past week, and when I cracked them found them both to have double yolks! How common is this in duck eggs? I'm afraid I don't get too many in my chickens' eggs. Both these double-yolkers went into our Thanksgiving pumpkin pies, I can't wait to taste them! Happy Thanksgiving everyone!