I have a variety of six different chicks, all three weeks old. I have cochin bantam, black bantam, rir & barred rock and of course my silkie. Silkie, aka Peanut is just a baby. I don't mean that figuratively, as she is only 3 weeks old. I mean this literally. She is taking longer to feather. She doesn't engage in chicken "challenge" behavior and tends to ignore this posturing by the other birds. She just is more babyish than the other birds. Do silkies take longer to mature than other breeds? To me it seems obvious, but I would love to know that I don't have some rogue bird doing something unusual.