Uncommon but unmistakable. Large spectacular owl of humid evergreen forest in tropical lowlands and foothills. Often roosts in pairs at low levels inside the forest, sometimes in rather open situations. Roosting birds often hold their long, bushy white eyebrows flattened, but raise them when alert. At night, favors dense forest canopy. Calling birds can be very difficult to locate. Call is a short, throaty, intensifying growl, typically repeated every 5–10 seconds.