My chicks are now 3 weeks old and will soon be making the outdoor tractor their home. I live in an urban area and really wasn't incredibly concerned with predators that much except for a few cats that troll the area. BUT tonight i heard from a neighbor that they've recently spotted a family of Possums in and out of their backyard. I have yet to see these guys but now am worried if they are the type of animal that will harm my girls. Should I now safeguard the coop from possums getting into the coop? And are they diggers? Should I protect the coop with underground wiring?