I got a coupon for a free egg laying hen with my chicken coop. I don't really want to add another chicken to the mix, but the story is tugging at my heartstrings - the hens are rescues from a factory farm. What to do? The hens are currently at the Marin SPCA which means (I assume) that the ones that are up for adoption are healthy. But ... I have 4 chicks who are 23 days old ( but I swear one of them is at least 4 weeks) and I don't want to have them bullied by an old hen. But ... rescued from a factory farm .... Is this the chicken math that I hear spoken of?