Weasels and Mink typically attack early in the morning and late in the afternoon, returning sometimes days later if they spared any lives during the first raid. But they have come in broad, open daylight in some cases. They creep into the pen, when you least expect them, through tiny holes and burrows under the foundation. They can dig or crawl into almost anything that isn't tightly secured. They run at the chicken from the front, overwelming it, and slit it's throat for a quick kill. They drink the blood and eat the innards, sometimes taking the head. Then, when they are finished, they drag off as much uneaten food as they can carry back with them. They have also been known to indescriminately kill chickens, for no reason but pleasure, after they're done eating. If you've ever had a pet ferret, then you're probably familiar with the kind of personality a small pack of weasels sports. Fast, sneaky, highly organized little assassins with a soft spot for peanut butter. Also, remember that there will be several weasels involved in the attack and disposal, not just one. Good luck.