We have a small chicken coop. Our chichens lay eggs and have become very close to us. We had a fisher that got an ill recovering chichen last year 6-06. We have had no sightings since. While we were on vacation the first week of 8-07 a fisher got into our small coop and removed two chickens and took the head off the other two. I am looking for ways to prevent fishers or any other animals getting into our coop. Any suuggestions would be greatly appreciated.