Well done Drew in finding references. I remember some years ago when on a sniping exercise on some open heather moorland. I must have been well cammed in because I had a pack of red grouse land all around me. What interested me most was the faint little calls that they made. I suppose that landing in thick heather they would need to call the brood together for the night and the faint calls were a way of doing just that. Quite a privilege to be a part of and I only wish I could have recorded it in some way as I would doubt many would have witnessed this behaviour. After a couple of minutes they must have rumbled me as they moved off somewhere else. Lagopus.....