I have ten chickens about 12 weeks old. Lately when I enter the run, which I do often about 2 to 3times a day, they are coming up to me and pecking my legs and feet. I feed them enough food so they have available all day. This new behavior is puzzling not to mention a bit painful. It does appear that they are aggressive it appears to be more curious behavior. they allow me to pick them up and pet them. If I move within the run they follow and continue to peck at my legs. any thoughts on why now all of a sudden they are doing this?