We have 6 pullets, 4 are 12 weeks, one is probably 11 weeks, and one is probably 10 weeks. We got the two youngest as 6-8 week olds, from a crowded bin, and they naturally displayed more stressed behavior than the 4 we raised from day-olds. The youngest, a BR, is starting to display more aggressive behavior than the others. While they all do a little chest-bumping and hackle-raising, she jumps at the others with her feet, and this morning jumped on top of my poor, sweet, Speckled Sussex's head. Is this behavior because she's the smallest, and the bottom of the pecking order? If so, will she outgrow it once her size matches the others'? Or is this aggression something she'll always have? Should I think about rehoming or culling her?