Great Hornbill

Overview

The Great Hornbill (Buceros bicornis) is one of the largest members of the hornbill family, reaching lengths of up to 120 cm and weighing 2.6-3.9 kg. Distinguished by its spectacular appearance, this species features predominantly black and white plumage, a massive bill topped with a bright yellow casque, and a distinctive loud call that resonates through the forest canopy. The species inhabits evergreen and moist deciduous forests across South and Southeast Asia. Great Hornbills are primarily frugivorous, feeding mainly on figs and other forest fruits, though they also consume small animals including lizards, snakes, and large insects. Their feeding behavior makes them crucial seed dispersers for many large-seeded rainforest tree species. They are typically seen in pairs or small groups, flying with characteristic heavy wing beats that produce a loud whooshing sound audible from considerable distances. The species exhibits remarkable breeding behavior, with females sealing themselves inside tree cavities using mud, droppings, and food remains, leaving only a narrow slit through which the male passes food. This unique nesting strategy protects the female and chicks from predators during the vulnerable incubation and early chick-rearing period. Great Hornbills face significant threats from habitat loss and hunting, particularly for their casques and feathers, leading to population declines across much of their range.

How to identify

A very large bird (95-120 cm) with predominantly black upperparts and white tail with black band. The massive yellow bill is topped by a bright yellow U-shaped casque with black markings at the base. Males have red eyes with black orbital skin, while females have white eyes with red orbital skin. The neck and underparts are white to cream-colored. In flight, displays broad white wing bars. Calls include loud, far-carrying 'kok-kok-kok' barks and deep roaring sounds. The wings produce a distinctive loud whooshing sound during flight.

Habitat

Primary and mature secondary evergreen and moist deciduous forests, typically below 2000 m elevation. Prefers areas with large emergent trees suitable for nesting. Requires extensive forest cover with abundant fruiting trees, particularly figs.

Distribution

Found across South and Southeast Asia, from the Western Ghats and foothills of the Himalayas in India and Nepal, through mainland Southeast Asia including Myanmar, Thailand, Laos, Vietnam, Cambodia, and parts of southern China, to Peninsular Malaysia and Sumatra in Indonesia.

Diet

Primarily frugivorous, with figs (Ficus species) comprising a major portion of the diet. Also feeds on other fruits including Artocarpus, Dillenia, and various forest fruits. Supplements diet with small mammals, birds, reptiles (especially lizards and snakes), large insects, and occasionally small amphibians. May raid nests for eggs and nestlings.

Behavior

Highly vocal and conspicuous. Usually found in pairs or small family groups, occasionally gathering in larger numbers at fruiting trees. Flight is labored with distinctive loud wing beats. Perches prominently on tall emergent trees. Exhibits strong pair bonds and site fidelity. Active during day, roosting in tall trees at night. Shows regular movement patterns between feeding and roosting sites.

Reproduction & life cycle

Breeds typically between January and April, varying by region. Nests in large natural tree cavities in tall emergent trees. Female seals herself inside the cavity with mud, droppings, and food, leaving only a small opening. Incubates 1-2 eggs for approximately 38-40 days. Female and chicks remain sealed for about 4 months total. Male provisions the family throughout this period. Chicks fledge at approximately 80-90 days but may remain dependent on parents for several more months.

When to look

Breeding season typically January-April. Most vocal and visible during breeding season. Can be observed year-round in suitable habitat, though may undertake local movements in response to fruiting patterns.

Cultural significance

Holds great cultural and spiritual significance across its range. Featured prominently in indigenous folklore and tribal traditions of Northeast India and Southeast Asia. The casque and feathers have been traditionally used in ceremonial dress and headgear by various tribal communities, leading to hunting pressure. Considered a symbol of wildlife conservation in several regions. Protected under various national laws across its range and listed in CITES Appendix I.

Similar species

• Rhinoceros Hornbill (Buceros rhinoceros)
• Rufous-necked Hornbill (Aceros nipalensis)
• Wreathed Hornbill (Rhyticeros undulatus)

Watch on YouTube