The great horned owl is generally nocturnal. They hunt from dusk to dawn. But in some regions, they may be seen in late afternoon or early morning.
They make different sounds like the males call "hoo-hoooooo Hoo-hoo and the males call is lower pitched. The females call "Karrooo-oo" or when intruders are attacking the call is like whaaaaaa-a-a-aarrk .