Hawk netting can be incredibly effective because it offers a physical barrier. However, remember that smaller birds of prey (e.g., the sharp-shinned hawk) might be able to fit through, depending on the mesh size. Additionally, predatory birds can fly under the net, and will exploit any openings that may exist. So you have to close off any large openings and use fencing to deter predators from flying in under the net. We’ve had hawks land on an adjacent fence and then hop down to get under the net. When we realized what was happening, we attached the end of the net to the top rail of the fence.