We get those big ones all the time! In 3 years we've only had 1 double yolk. We have Barred Plymouth Rocks, Comets, Araconas, 1 Hampshire Red, and a few mixed breed of the above. No idea who lays the big ones!
We have 12 chickens of mixed breed, 1 rooster, and 3 guinea fowl. We recently discovered (or figured out I should say) that 1 of the guineas is a male. All has been well, they all lived together the whole winter with no problems. 2 days ago we discovered the male guinea attacking one of the...