We're surrounded by a lot of woods and old pasture land. PERFECT hawk habitat. Last fall I had a Cooper's Hawk migrating through that within about 5 days made repeated dives at the chickens. Never successful, and I think it was because of our Chineese geese. Things didn't quite work out so well with the geese and chickens, so I got rid of the geese a few months ago and replaced them with 3 guinea fowl (1 male, 2 females). All spring we've had a pair of Red-tailed hawks that have been around. I never seen them eyeing up our birds, but they'd fly over and I'd see them perched in old snags in the neighbouring fields. Well, last night I came home and realized the male guinea was missing. I can't say for SURE that he was predated on, but I searched high and low for him and can't find even so much as a feather. Whether he left on his own accord or was predated is no-matter... it's still got me nervous enough that I want to step up my hawk deterent system a bit. Our chickens free-range in a large fanced old pasture. It's far too big to cover it or put netting over, and I don't want to make it any smaller, I'm acutally looking at enlarging it this spring so they don't turn their run into dirt so quick (with 2 separate runs to cycle pastures). I do have a very responsible roo, and maybe that's why my girls have been fine all this time. I have a dog (lazy) and he doesn't get access in/near the chickens, so he's not a deterrent. I actively encourage crows along with feeding the wild ones in the field. However, I need to do more. This spring I will be planting a number of apple trees within their run, but they won't amount to much cover for a few years. There has been a lot of mention of fishing line strung up. I like the idea, but I'm worried I won't see the fishing line well and if some breaks or sun-rots and falls into the pen I won't see it and the chickens might try to eat it. Instead, I was thinking of getting some bailer twine and some tall poles or stakes (so I can walk under it all) and running a few lines back and forth. I was curious what other people have done with the fishing line, and how close the lines have to be. Could I get away with every 10 feet or so, or do I have to make it a thick weave of string? Any advice?