I was outside last night at dusk and noticed a possum half up the tree in our run, when I disturbed him he panicked a bit and starting running up and down the trees trying to get out but I have bird netting over the run so he couldn't get out. Finally I backed off and he ran across the ground and straight out through the CLOSED gate! Obviously the holes in the gate are too big, although it was a very small possum, I'm wondering if I should worry about more getting in or if not. The girls weren't worried at all by it.