I found I ginornous buff colored egg. My first thought was that one of my ducks finaly started laying. But then I recalled reading that rouen/mallard eggs were a greenish color.. So one of my BO laid a huge egg, twice the size of the bigger ones they have been laying. How would a super big egg do if incubated? I know they say small eggs= small chicks.. what about huge eggs? are their any health risks to chick hatched from oversized eggs? We have had one of our BO girls lay a smaller double yolk, so my family was torn between trying to incubate it, and cracking it open to see how many yolks it has.