The barn owl is the one which says "SHREEEEE", not "hoo". They live pretty much everywhere. You'll only ever see them in the daytime if something woke them up and chased them.
They eat rodents, bugs, smaller birds- anything that's big enough to catch and put in their beak, and small enough for them to lift while flying. Since they eat so many mice and rats, farmers love them.
They're seen as a bad omen in some places, but really, they're good omen- they keep the crops safe from rodent pests.
They hunt by sound, flying low and silently, listening for the crunch or swish of a small animal's movements.