Well, I have to agree with Don. Times are tough right know. Someone may have take one thinking "humm I will get eggs" not realizing 1 egg day wont do much for a grown man (or woman) especialy a family. Killing a chicken for dinner, maybe. If it wasnt 2 legged I would say it was an owl or a hawk. They will come in , hit the bird and haul it off before it has a chance to fight, thus leaving no sign there. Even if a cat did attack, you would have feathers and sign. You may have had a cat in the area, but if he hit you birds you would know it.