I live in the city and will be having a coop in my little back yard. We have LOADS of squirrels and I see possums in my neighborhood. I've heard we also ave racoons and skunks. I will have a coop that my hens will go in at night that will have an attached run that is currently covered in chicken wire. What are the best things I can do to make sure the possums and racoons don't get in???