Some of my chickens started laying ~ 2 months ago....some haven't due to age and breed. Three lay brown eggs...2 red sex-links and an Australorp. I have gotten 4 double yolk eggs. I am wondering which of my chickens is laying this egg? I think maybe it is the Australorp since the shells are very similar in color to the other larger egg that I get 1 of every day. For my question, do Australorps generally lay larger eggs than Red Sex-links??? Thanks!!