Kept finding the occasional headless rabbit carcass in our back yard back when we lived out in the country. Rabbits congregated there after dark often to feed on apples fallen from our apple tree. Couldn't figure out what was doing it until one night I happened to hear some frantic animal squealing outside, grabbed a flashlight and caught a big owl in the process in the light beam. Later on I found where it had a huge old nest built high up in a giant old oak tree in the woods back behind our property.