The mom of my 4 week old chicks is loosing interest. I have been letting them out to free range together for over a week now and they all seem to love it. I noticed yesterday that the mom was away from the kids most if not all day and didn't come back in until that night. This morning she came out when I opened the door and just went out with the other chickens leaving the babies to themselves. Is this normal? The other mother who has 3wk old chicks doesn't let the 4wk ones stick around the others very often so they are on their own pretty much.