I have Red Sex Links and they lay those size eggs every once in awhile. I try to see if any of them are walking funny after laying such a huge egg. They all seem to be very happy and content, can't tell which one has laid such an egg!
I just took the ruler to my egg and you have me beat by 1/4 of an inch. I thought my egg was big. I have RIR's also and with only 2 hens laying it's hard to eat eggs in the morning. LOL Today I only got one egg.
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Our first large egg like that was probably one of our GC's 3rd or 4th egg. I suppose a large egg could be a first! But the poor chicken would probably never want to lay another egg!!