So we have had chicks for a number of years now. The coop is on the south side of our house and the birds free range except when we have to protect the garden. We have a second house on the north side with tenants who just built a coop and now also have chickens (and ducks). The weather is starting to warm up and the other day our hens and roo headed up the driveway heading for the spot where we used to feed the deer last fall. Before they got there our neighbour came out and chased them back home as her husband's birds were out, He was away and she was worried that the two flocks would get intermixed. When I found out what happened I told her not to worry, thinking that our roo would lead his girls back home but now I am wondering.... The two flocks are normally out all day, within earshot of each other but have never intermixed in past for some reason, even though they could if they wished. Should we worry? Some of the birds are distinct but there are a dozen RIR's , some in each flock.