Interesting as I was once walking along-side a small stream in a gully with about 12 inches of snow covering when a Heron flew down the gully and the snow erupted with Red Grouse which had been hiding below. The heron was no real threat to them but I guess that its gliding flight reminded them of some sort of large bird of prey. I would have had no idea the grouse were there and I suppose that I would have been able to walk past quite oblivious but for the heron. Lagopus.....