A little background. I have 2 9wk barred rock pullets. Stayed in the brooder for 5 weeks then into the coop for the last 4 weeks. The coop is a large chicken ark with a 6'x6' footprint so the chicken run is underneath the coop. I don't need to open and close a door twice a day. We started letting them out into the yard for about 15 minutes right before bed 4 nights ago. When they come out in the yard, they stick close by us, within about 10 feet. They are comfortable standing very close to us, just don't like being touched. Every evening, they walk up to one of us and crane their neck out and then fly right at us. They have done it when we are both sitting on the ground and standing up. We've learned that if we stick our hand out towards them when we notice them about to do it, they will stop. Is it a dominating move? Are they scared and want to feel more secure? Are they being aggressive? What does it mean?