OK, so I've seen that using 2X4's with the wide side up is "ideal" for them to roost flat footed. I like the idea of using tree limbs as roosts though, They seem to enjoy the temporary one I have in the coop and the one in the run. They don't roost at night yet but, they nap and rest on them.
My question is how large in diameter "should" the tree limbs be? The ones I have right now range from 3.5-2" across. Large enough? Should I keep searching for larger?