HI. I now have 7 guinea fowl.... Today a couple started making the loud adult noises... what age are they when this happens, as I am curious to know how old they are? They are still mostly brown.. but some adult coloured feathers coming through now. Most still have the stripy neck and head of the young keets. They have been in my chicken coop 2 weeks.. when can I let them out? Do they have to be fully grown before they can go free ranging? They can fly now.. and roost up with the chickens. Lastly how long does it take them to become adult? They seem to be getting bigger each day.. far faster then my chickens do.