i have 15 chickens that are about 12 weeks old now. I let them out of the coop to free range all day and shut them up at night when they go back in to roost. The Anconas, Minorcas, Bramahs, Red Stars and wyandottes all come inside at dusk to roost. But I have a single White leghorn, and for the last three nights she has tried to roost in a tree instead of coming back inside the coop. The first two nights she was only about 5 feet off the ground and I chased her down from the tree. But last night she got smart and was about 15 feet high. So she stayed there all night. I'm worried about possums or coons getting her. Is there anything I can do to stop this. Clipping wings won't work as the limbs of the trees go all the way to the ground