Ok, I assume that chickens, like any other creature, develop on their own individual time schedules. but... I find there are some real developmental differences between my two Buff Orpington chicks that are now both a big 33 days old, or 4 1/2 weeks about... They looked pretty much identical when I got them at 4 days old. Now there is a big difference between them. Here they are from the side, This is Ophelia This is Olivia Olivia still has lots of chick fluff especially on her head and neck. As you can see in the photo below, Ophelia has pretty much lost all her chick fluff. And the Barred Rocks, which are nine days older, are all nicely feathered out. so... Why the difference? Did you notice the difference in the size of the tails? I have felt them and the tail it's self feels the same size, it is just Olivia doesn't have any long feathers on her's. But don't the Buff Orpingtons not have much of a tail to speak of? From photos I have seen of adults Buff Orpingtons they seem to not have much of a tail. Any ideas on this???