DH and I are researching/planning for chickens and have decided to use an existing 10'x15' dog pen for the coop and run. The biggest issue I'm having is that there is a huge oak tree growing in it and I'm worried about possums or racoons coming down the tree into the pen. Is it something to worry about? I don't see a lot of racoons but I regularly see possums in the yard. Should I attempt to cover it in hardwire and attach it to the tree? Thanks for any help! I"m really enjoying my research here on the site I already feel addicted and I don't even have any chickens yet!