I have a few (6) backyard chickens. Two of my Rhode Island Reds, who are 7 months old, have become very feisty. When I head outside to let them out of the coop for the day and other times when I'm in the backyard, they will walk up behind me and nip at my calves. They have done this to my 7 year old son once too (sadly on bare legs). This morning one of them nipped my hand. They are not breaking skin, but summer is coming, and I don't want to have to be running from the red twins every time we are in the backyard There are other times though that if I am out with the chickens and go to pet them, they will crouch down and let me pet them without any problem. Any suggestions on how to stop the bad behavior? If not, they may need to find a new home. Thank you for any advice!