Are you sure that's a guinea egg? It looks like a turkey egg to me (the one in the middle). It's shaped more like a turkey egg and has spots. My guinea eggs never have spots.
rooster - we have pearl? guineas, the regular dark gray with white spots, and a couple lavenders, we have never had an egg this big before
Chickenannie - nope it can't be a turkey egg since my guineas are contained and separate from the turkeys, I do get eggs with spots, not normally so pronounced, but that might just be due to the larger size
I did have a chicken rooster in the pen, but he is just a little guy, maybe five pounds and all his sisters lay eggs just a little bigger than the 'normal' guinea egg, so I don't think he did it
lilcountry - we haven't eaten any of our guinea eggs yet, we get to much money for the keets, but I have been told they are 'richer'