I'm brand new at this, so forgive me if my question doesn't make much sense. I've cleared out an area, put up a coop, and hope to get my chickens this weekend. The only thing I need (at least I think it's the only thing) is to build a run. Can anyone please tell me if I need to put a wire cover on top? My initial thought was keeping them in, but then I thought that without a cover, other animals could get in as well. Thanks for any help and advice.