I'd love to keep them inside till they were three months old, but my boyfriend's starting to whinge a bit about their smell. I don't think they smell at all, but he doesn't like it. At nearly six weeks old they're almost fully feathered now, all apart from wee baldy patches under their wings, so I suppose I can get them out to the big coop very soon. Oh, and I checked their bag of crumbs, and it is definitely non-medicated. Maybe that's more common over here in the UK?