I'm not sure which of my hens was working so hard today but HOLY Chicken eggs Batman!! I have one Buff, one Australorp, 3 Reds and a black banty...I'm guessing it was the Australorp... but maybe not? Couldn't find a Guiness World Record for largest chicken egg - did find plenty that appeared larger. I don't have a kitchen scale to weigh in oz so I'm not sure of it's weight... I'm gonna crack it open later and see if it is double or triple yolked... She's a beauty! but OUCH!!!!