Our only predator losses have been to a hawk. I wouldn't believe a red-tailed hawk would eat a chicken, but I caught him red-handed (or beaked) on the third bird lost in a week last summer. They can't carry them away, so they eat them on site. The solution that has worked for us is to string fishing line over our poultry netting. A pain in the butt when I move the fence (every week) but it has prevented further losses. Since the new flock is too small to stay in the netting still, we have been baby-sitting them out-doors and my husband shoots a BB gun in the direction of wheeling hawks, which sends them in the other direction. We also have a pair of ravens nesting nearby, but since we've been baby-sitting they have not been back by (at least not close). Hopefully they won't be a problem once their young are grown and our birds are bigger.