Sounds like a weasel to me.
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Sounds like electric fence would be a good thing for you to look into.
Sounds like a mink or weasel. Wait, rats can kill adult chickens? Yikes; we’ve got a big one inside the run and have set a trap. Honestly, I thought in daylight a rat wouldn’t stand a chance against a flock of 9 chickens. Is there danger in both the day and night?