Ok, well my pullets have now reached what I consider full size-- one problem now... there are likely too many birds in their tractor. We were hoping to have been moved by now to our new farm where I could have built a larger coop. I am using a 4x10 tractor and have just about 3-square foot per bird. I do move the tractor as needed to give them new grass and a change of scenery. I DO HAVE another tractor/pen that I could move 1/2 into, but my gut feeling says NO -they are justing starting to lay, and I do not want to change something this drastic and mess them up -they have been together since day 1 -we are close to winter, where their body heat will be important and they cuddle up nicely. They EASILY fit in the upper-deck of the tractor and each have space to perch. What should I do? Should I do the move/split, or keep em together? I suppose once winter hits, there is no need to move the tractor to fresh grass (since there is none). I could make/connect a chicken run to the tractor to give more exercise space.