Anyone in here have chickens?

Something broke into my sister's chicken run that was attached to a chicken coop. One chicken had 6 chicks and was a good defender against the other chickens, though none of them really bothered the chicks. She keeps all the chickens in the coop at night, but she lets the mother and her chicks stay in the chicken run all night. Something broke through a small weak spot in the chicken wire and got in. It killed and ate most of the mother and all 6 chicks. Never found 5 of the chicks but one was half-eaten. The mother defended them to the end. The foxes are too big to have done it. What small animal in Missouri would/could do this?

When I find this thing its going to pay!
When I find this thing it's going to pay!
Anyone in here have chickens?
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