I have cameras all around my house and a six foot chain link fence around half my property. As an added precaution, I installed 3 laser trip wires that bounce all over the place from mirror to mirror. So far, I've caught 2 deer, 5 cats, a raccoon, a bobcat, 3 black bears, a skunk, three or four rabbits and an owl milling around after they interrupted the laser beam. I had to set it a bit higher off the ground to avoid getting up all hours of the night to see what set it off.
My cameras have a 100 meter infrared range at night, so I can see pretty well around the house at night. It's kind of fun to sit up at night and see what's around the house. All those little critter eyes glowing in the cameras.