Last night, we had 12- 6 week old chicks taken. They were in a brooder in a shed. Something chewed through the plywood and took them all. There were some feathers and a little skin, but no bodies. The whole chewed in the plywood is not very big, barely big enough for the chicks. So my first thought was rats, but I thought people have said that they would eat the heads. We live in Michigan and until this time, our main predators were raccoons. But I don't think it was them this time. We haven't had a bird taken in 3 years. And we have never had anything like this. With this many birds.