Mine and my neighbor's chickens run together (free range) during the day. They go between our yards as they please through a hole in the fence. My neighbor has a small rooster, bantam of some sort I think. He's been getting agressive in our yard towards us. He doesn't come seek us out to attack but if we get close to him or what he thinks is his space, he'll start posturing and eventually attack if we stand ground or fight back. I have a three-year old little girl that's spunky enough to swat him if he comes at her and she has. But the rooster has taken it a bit further and is attacking her higher and higher. As in first it was just at her feet which are usually covered in rubber boots, next couple of days he started flapping and jumping a little when he'd go at her, and the last time he jumped up and got her on the hand. They've always allowed my chicken(s) range of their yard too and are very nice about seeing that my chicken gets home for the night and about the birds sharing the space. We've traded feed and supplies a few times too. As I write this I realize the answer is not to let the chickens share yards and space anymore, as in fence out. If he were my bird, he'd be lunch, or at least a light snack but he's not, so I can't. Oh- They have, or had a bantam hen too that I haven't seen for a few days. I did see the rooster attempting to mount her a couple of times so I'm thinking she's sitting on eggs or something got her. Could either of these scenarios cause the rooster to act out?