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Except chickens aren't naturally selected. Modern diets and modern management practices are what has allowed poultry to be a food source for us. Otherwise well, look at pheasants and gamebirds to get an idea of the smaller sizes and seasonal laying that would result in managing chickens the same...

Not problem for humans but crowding out native wildlife. Not an invention, just facts. As far as original question of post, the Mediterranean breeds tend to be very, uh, attentive and cautious which leads to them being decent at avoiding predators. Birds may be able to survive on free range...