Most of my hawk deterrents are modifications of other people ideas that I have found by searching on line. I will be attaching pictures tomorrow. I have a "Chicken Web" over a portion of my yard that is made out of fishing line and 5ft lenghts of 1/2 in PVC pipes. This was my most expensive project. It cost about $25 to buy the pipes, fishing line and connecters. I may have been able to find used or unwanted pipes on Freecycle, but it was worth the monitary investment to get the project done quickly in this case. It was made by mounting the pipes on the chicken coop, clothes line, grapevine, fence and a tree. Once my pipes were in place, I threaded the fishing line through the connectors creating a "web" I have made windsocks out of empty feed sacks that I have hung on the worlds ugliest shed, built by my significant other. He says they look like trash, I think they compliment the sheds style. I layed the feed sacks flat and cut it into 1 1/2-2 inch strips from the open end (top) to towards the closed end (bottom), stopping about 6 in from the closed end I cut a slit in each side of the bag in the 6 in section. I stapled corners of the closed end together. I hung them from the shed by some used window screen spline. I stapled the spline to the closed end of the sack and the other end of the spline to the shed. This project had no cost, all of the materials were repurposed I mounted one 5ft lenght of PVC pipe (left over from the chicken web project) to the toilet vent pipe on our roof using zip ties. On the top end of the PVC pipe I attached a kite using another zip tie. The kite was left behind by a former tenant and all other materials were left over from other projects. So no direct cost on this one either! We have a plastic owl that was given to us by a friend. My children have fun moving it to different locations around the yard. I was picking grapes a few weeks ago and had a small heart attack when I noticed it peering through the leaves at me. The children and spouse found that hilarious! I am going to be looking for some plastic crows on clearance after halloween. Stay tuned for pictures!! I dont know if any of these things work, but I have not had a hawk attack since putting these things out!! I hope people find these things helpful in keeping your flocks safe.