The horned owl is just about the biggest owl ever (but not quite) and lives in the Americas. This is the owl you can hear at night actually saying "Hoo", in American forests.
Sometimes, crows will spot one of them as they sleep, and chase them away. They eat rabbits, mice, voles, rats...just about anything furry they can lift. And they're big, so they can lift pretty large animals.
They can live to be very old, for a wild bird, sometimes up to 40 years old or so. Very few things in the wild can harm them or catch them, so they're safe once they're fully grown.