FaunaHub

Hornbill (family Bucerotidae)

BirdTropicalFrugivore

Great hornbill (Buceros bicornis) in Bardia National Park, Nepal.

Great hornbill (Buceros bicornis), Bardia National Park, Nepal.

Image: Dasrath Shrestha Beejukchhen (Bablu), CC0, via Wikimedia Commons.

Overview

Hornbills are large, charismatic birds of the family Bucerotidae, found across tropical Africa and Asia. They are best known for their big, down-curved bills, many topped by a hollow structure called a casque. The animal shown here is the great hornbill (Buceros bicornis), one of the largest Asian species.

Hornbills are important seed dispersers in tropical forests and are famous for an extraordinary nesting habit, in which the female seals herself inside a tree cavity while raising the young.

Conservation note: while some hornbills are widespread, several forest species are of conservation concern due to habitat loss and hunting. Verify a particular species' status at iucnredlist.org.

Habitat & Range

Hornbills occupy a range of habitats across sub-Saharan Africa and South and Southeast Asia, from dense tropical rainforest to open savanna and woodland, depending on the species. Forest hornbills in particular depend on large old trees with cavities for nesting and on fruiting trees for food.

Diet

Most hornbills are omnivores, with many forest species eating large amounts of fruit, supplemented by insects and small animals; some savanna hornbills are more carnivorous, taking insects, small reptiles, and other prey. By swallowing and moving fruit through the forest, hornbills act as key seed dispersers.

Behavior

Hornbills are well known for their unusual breeding behaviour: in many species the female enters a tree cavity and the entrance is sealed almost shut with mud and droppings, leaving only a narrow slit through which the male passes food while she incubates and the chicks grow. This protects the nest from predators. Hornbills are often noisy and conspicuous, with heavy, whooshing wingbeats in the larger species.

Human Interaction & Conservation

Hornbills hold cultural significance in many regions and are valued for their role in keeping forests healthy through seed dispersal. The main threats to forest species are loss of large nesting trees and hunting. For current, species-specific status, consult authoritative sources such as the IUCN Red List.

More photos of the hornbill

Great hornbill showing its large bill and yellow casque.

Great hornbill (Buceros bicornis).

Image: Raman Kumar, CC BY-SA 4.0, via Wikimedia Commons.

Frequently Asked Questions — Hornbill

What is the casque on a hornbill's bill?
The casque is the helmet-like structure on top of many hornbills' bills. In most species it is hollow and lightweight, and it is thought to play roles in display, recognition, and amplifying calls. (A few hornbills have a solid casque, which has unfortunately made them targets of illegal trade.)
Do female hornbills really seal themselves into the nest?
Yes, in many species. The female enters a tree cavity and the entrance is sealed nearly shut with mud and droppings, leaving a narrow slit. The male feeds her and the chicks through this gap during incubation and early growth, which helps protect the nest from predators.
What do hornbills eat?
It varies by species. Many forest hornbills eat large amounts of fruit along with insects and small animals, making them important seed dispersers, while some savanna species are more carnivorous, taking insects, small reptiles, and other prey.
Are hornbills related to toucans?
No. Hornbills (an Old World family) and toucans (a New World family) both have large bills but are not closely related — a case of similar features evolving separately. Their resemblance is superficial.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.