Huge, spectacular, mostly black hornbill. Males have a large cream-and-white bill, and females a much smaller horn-colored one. In flight, shows a mostly white tail with a black center. Found in lowland rainforest, forest edge, and gallery forest. Usually in pairs or small groups of up to a dozen. The loud calls are surprisingly high-pitched yelps and honks that are often given in a quick series, higher and less rasping than similar calls of Black-casqued Hornbill. Similar to Black-casqued Hornbill in appearance, but male separated by the yellow casque, female by the paler bill and neck, and both sexes by the completely white outer tail feathers.