My two Orpingtons until this week were pretty much identical. Then on Sat. I noticed one is maturing and the other is not, at least not yet. They were hatched the same day, 10/19/08. The one less developed is actually a much bigger chicken in size, she was stretching her neck out in the photo so she looks "thinner" in the neck than the other one. But she is taller and bigger over all. I was wondering what could cause the difference, my Barred Rocks are identical in develpment of combs and wattles, also hatched on the same day. Here is Olivia, I 'd think she is right on schedule for her developemt. Here is Ophelia, she still has pale underdevelped comb and wattles. I do notice Ophelia is not as interested in eating as the other three, she will sit and preen while the others are eating like craxy any new thing I give them. She is much more cautious about new things. I think she is "low man" on the totem pole, though she is the biggest of the four. She doesn't seem as "smart"??? Or maybe it is just her cautious nature. She seems "slow"... anyone ever had this kind of hen???