My Silkies have the option of both, run and range. I have never lost one to a predator. I allow them to come and go as they please with the run door open through the day. Even my Silkie mumma with newly hatched chicks takes them out to range. They never go far though, maybe 100m from the door. I have a ratio of 2 cockerels/roos to 3 or 4 pullets/hens. The boys are great to keep an eye out for the ladies when ranging. I have to mow the grass in the run because they are mostly out ranging eating that grass! Lucky I have some more chick mowers on the way soon to help me with my chores!