It's not unusual at all, and it does not affect their adult plumage in any way.I just hatched out some fat fluffy babies from my Faverolles trio. The thing is, some of the chicks have very light "chipmunk" striping in black. On a few it is as subtle as a couple of dots. I don't have a picture currently but I can get one. I know it indicates dirty genetics but I'm wondering if you all know what it could be?