Lizard man? Do tell... 

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I wish there were an avatar showing extreme embarrassment. I'm sorry I mentioned this in a public forum.Lizard man? Do tell...![]()
Sounds like a weasel to me. Was the breach near the base of your pen? I lost a duck to a weasel many years ago. It just ate the neck. Know it was a weasel because we caught it trying to drown another duck the next day. It got in through a tiny crack at the base of our pen. We built a new duck coop after that. Used a ton of hardware cloth. Haven't lost one since.I read this while researching weasels.
[Weasel kills are identified by severed heads and severe wounds to the back of the neck.}
And the chick that was eaten was attacked on the head and eaten partially down the neck. The other one was just killed. This may mean it had it's fill or something scared it away.
I checked all the areas where the trees go through and they are very tight. Hopefully I have patched all the overlapping seams now. It's all just going to be speculation at the point. But I set my trap tonight and just because I catch something doesn't mean that was the culprit. Because we have all sorts of wildlife where we live. At least I can start by re-locating all the suspects.