I always lock up my chickens every night. They have a solid stick built house. One morning when I went to open them , Robin and Barbeque jumped out in a frenzie and when I loved in I seen the other 9 chickens dead including 2roosters. Broke my heart!!! Couldn't figure it out until I read some info on line. Their bodies were all placed in a perfect row which indicates a weasle. And the only hole I had was about 2x3inches. Now I only have two left and they were in shock for quite a while. That's when I joined back yard chickens. I put them in a smaller pen and weasle proofed it. I will get more in the spring hopefully. So make sure you don't have any holes for weasles to get in. They kill just to kill. Tammy