I'd agree with the recommendation for the electric fence. I use electrified poultry netting myself (650' of it) to surround the coop, and it works great to keep out ground preds. Motion lights may work for a time or two, but I have a motion flood light on my back deck, where the garbage cans are. I can be sitting there watching TV, and the light will go on. I'll take a look out the back window, and see a coon peaking up over the steps. Then they will usually sneak on up there and attempt to rob one or more, of my garbage. Unfortunately for them, the old .45 is in standby. They get so intent on what they are doing, they don't notice me sliding open the window, and drawing down on them. I've knocked off more than a couple of coons this way. It seems that, all a motion light does is make it easier to see what they are doing.