It’s the irritating noise. If they were quiet, I wouldn’t care as much but they do leave a mess. Now, I have huge owls that like a tree in the backyard at night. The loudest noise I’ve ever heard a bird make. HOOOOOOOOOOOOOO, HOOOOOOOOOOOO. You can hear it a mile away. Luckily they don’t like my 500lm LED flashlight on the flicker setting, but I have to get-up, walk outside and light ‘em up to scare them off...Gee, I really like 'em. They are fun to watch too, when there's a tidbit of food nearby and 4-5 of them all want the same tidbit.