I'm tending to think it's a dog or dogs at this point based upon what I've seen written on this subject. There's no "obvious damage" and I just came back from finding two downed, still warm bodies (dark brahma cockerel and chocolate turkey). I've lost at least 9 birds this way aside from these in the past 10 days. I'd been out with the birds only a few hours earlier and saw nothing out of the ordinary. Of course, everything was free-ranging on the property at that time and I noticed the deaths after dark when everyone else had gone home to roost. It's getting very disheartening! Two cockerels - Welsummer and Buckeye, three chocolate Indian Runner ducks, one splash Blue Swedish duck, two white Cochins, one red Cochin.