U_Stormcrow
Crossing the Road
Mine make use of more than five acres, less than thirty - and as @Ridgerunner expressed, the tribe thing is a definite reality. I find that my Roos each stake out a territory/feeding ground, then call for the hens to join them (usually between two and six answer the call). Occasionally, hens switch groups - Roos rarely switch territory unless I've culled on recently and remixed the flock dynamics.