 So vets and animal scientists have always had a focus on physical health, but there's more to it than that. People like Christine, who study animal behaviour, are interested in what chickens can't do in commercial farming systems that they might want to do. It's that idea of naturalness that appeals to so many of us when we're thinking about our food. So the birds are able to make their own decisions about things, choose where to be, choose who to be with, choose what temperature to be in.