We need more details to narrow down what's attacking. Another really great tool is a trail camera which can be found for around $100 to get one that does video, not just pictures. We've had great luck using ours with 20 seconds of video to see what's happening. Second- fencing and overhead nets are important to minimize loss. We bit the bullet and did chain link (6ft) with hardware cloth wired on, top to bottom, and a huge hawk-net over the entire giant run. It wasn't easy but I haven't lost anything to predators.