http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2004/04/07/FDGNM5VF9B1.DTL We were in the Safeway in our new town and saw they had the fertile eggs. So we got some just for an experiment and set them this morning. Decided to google "Rock Island" the brand name and found this great article on them. I think they will be RIR and Plymouth Rock crosses. I will post updates when we candle. Great article on the family they came from and how good the hens have it.