Great Horned Owls advertise their territories with deep, soft hoots with a stuttering rhythm: hoo-h’HOO-hoo-hoo. The male and female of a breeding pair may perform a duet of alternating calls, with the female’s voice recognizably higher in pitch than the male’s. Young owls give piercing screams when begging for food, while adults may scream to defend the nest. Adults make an array of other sounds, including whistles, barks, shrieks, hisses, coos, and wavering cries.
Great Horned Owls snap their bills in response to stressful conditions or disturbance, particularly when potential predators (such as humans) approach their young.