i have 4 about 1 month old silkies, 2 about 2 week/1 month (today!) old rirs, and 8 nine day old rirs. They are all females. ok heres my question; when/how should i give them roosting bars? Would pvc be a good material to use (i would get the really thin stuff), or is there some type of wood I should use? how should i make them stand up?