I came across this article on Huffington-Post this morning. It gives a good explanation for the verbiage on commercial egg cartons; for example, what does "all natural" mean (absolutely nothing).
http://www.huffingtonpost.com/epicu...angu_b_6809176.html?utm_hp_ref=taste&ir=Taste
http://www.huffingtonpost.com/epicu...angu_b_6809176.html?utm_hp_ref=taste&ir=Taste