I have converted a section of the hog house (no longer houses hogs) into a Guinea coop. There is a 4ft fence around an area of the pen outside. The guineas fly in and out of the area at free will. I want a pretty Rooster for the farm and was thinking of a bantum. I was told that a Rooster wont stay on the farm if there are not any hens. So I am thinking of getting some hens. They will share the coop with the Guineas. My question is this: Can the chickens fly over the 4' fence? it has a 2x4 across the top edges to keep it straight. I want the chickens to be free range also.