Hello, I am needing a little help identifying a predator that killed my young chickens. Last night I lost about 10 six week old chickens Yesterday I had let my young ones out to free range, and I forgot to shut the door on the brooder last night
. So when I came out this morning they were dead. I was only able to find two bodies. The brooder was only about a foot tall so it wasn't a very large predator. I found two barred rocks on the ground like they were trying to run out of the brooder. I didn't notice any marks but maybe a small piercing on the head. I had 6 that lived and one of which was a turken that I found laying on its side with its foot drawn up like it couldn't walk. I noticed it had a single small incision on its thigh that looks similar to a tiny paper cut. However, of the 3 seramas, several barred rocks as well as a couple of polish there were no sign of them. Not even feathers or body parts. I have ruled out anything that flies as they were covered. Any ideas? I can't find anything that quite matches the predator charts I've looked at. Help me please 

