I haven't cracked it yet, but probably a double yolk. We have 12 hens 1 rooster(got sexed wrong)
3 Plymouth Rocks
3 White Plymouth rocks (the rooster is one of these)
3 Easter eggers (the blue/green eggs like the 1 above)
1 Rhode Island Red
1 Australorpe (I think)
1 Golden Comet
1 unknown, maybe Barnevelder? (The Golden Comet Goldie we call her was broody for a 2 months, so I got a singular brown chicken to put under her in the middle of the night). Local feed and seed and nothing had labels.
It's the Rhode Island that lays those giant ones.
I used to have a few more of them when I lived in Florida, but they never laid eggs this big, but always good sized Brown eggs
They are great birds. Really calm, maybe even to calm at times. I was worried when my Australian shepherd ran outside when I wasn't there and got into the fenced area where I had the chickens. Was only 4ft so he just leaped over. Went out there and he was just laying in the middle of their area and they were just clucking around him. The dog happy to know they were herded, and them not caring at all that he was there.
Never worried after that.