Why Do Birds: I hate to say it, but I would be more worried about my family obtaining germs from the chickens living indoors than my chickens getting ill from living outdoors. Chickens belong outside, not inside. But that's just my opinion. There are exceptions however, some folks prefer to brood indoors because they have no other choice (access to heat lamps, etc), some will bring injured ones indoors (but have them in some sort of pen for the time being) until they are well enough to go back outside.