I have 3 chickens--a Barred Rock, RIR, and an Ameraucana (this is also their pecking order, from top to bottom). They are about 24-25 weeks old. The RIR started laying about a week ago. I noticed that shortly before she started laying, she went from being sweet and nonconfrontational to becoming more aggressive; she has stayed aggressive. She pecks at my pant legs as if she were trying to attack me (and not just out of curiosity like the Barred Rock). Is this change in behavior common or is it breed-specific, and should I expect the same from my other birds? Thanks for your thoughts.