FaunaHub

Cassowary (genus Casuarius)

BirdRatiteFlightless

Southern cassowary (Casuarius casuarius) showing its blue neck and casque.

Southern cassowary (Casuarius casuarius).

Image: Bernard DUPONT from FRANCE, CC BY-SA 2.0, via Wikimedia Commons.

Overview

Cassowaries are large, powerful flightless birds of the genus Casuarius, native to the tropical rainforests of New Guinea and northern Australia. The animal shown here is the southern cassowary (Casuarius casuarius), the largest of the three species and one of the heaviest birds on Earth.

Cassowaries are unmistakable, with glossy black plumage, a vivid blue and red neck, and a tall, bony helmet-like crest called a casque. They are shy forest birds but are powerful and should always be treated with caution and given space.

Conservation note: the southern cassowary is of conservation concern in parts of its range, affected by habitat loss, road mortality, and other pressures. Verify current status at iucnredlist.org.

Habitat & Range

Cassowaries live in tropical rainforest, and nearby woodland and swamp forest, in New Guinea, nearby islands, and the wet tropics of northeastern Australia. They depend on healthy, fruit-rich forest and are sensitive to its fragmentation.

Diet

Cassowaries are mainly frugivores, eating large quantities of fallen fruit, along with some fungi, invertebrates, and small animals. Because they swallow large fruit whole and travel through the forest, they are important seed dispersers — some rainforest plants rely heavily on cassowaries to spread their seeds.

Behavior

Cassowaries are solitary and territorial outside breeding. As with other ratites in this group, the male incubates the eggs and raises the striped chicks. They are generally shy and avoid people, but they are strong birds with powerful legs and a dagger-like inner claw, and can defend themselves if cornered or provoked — so a respectful distance is essential.

Human Interaction & Conservation

The main threats to cassowaries are loss and fragmentation of rainforest, vehicle strikes, and other human-related hazards; feeding them is strongly discouraged because it changes their behaviour and increases risk. Their role as seed dispersers makes them ecologically important. For current status, consult authoritative sources such as the IUCN Red List.

More photos of the cassowary

Southern cassowary in Papua New Guinea.

Southern cassowary (Casuarius casuarius), Papua New Guinea.

Image: Nick Hobgood, CC BY-SA 3.0, via Wikimedia Commons.

Frequently Asked Questions — Cassowary

What is a cassowary's casque?
The casque is the tall, helmet-like crest on top of a cassowary's head, made of a spongy, keratin-covered structure. Its exact function is still studied, with suggested roles including signalling, helping push through dense vegetation, and possibly sound or heat regulation.
Are cassowaries dangerous?
Cassowaries are usually shy and avoid people, but they are large, powerful birds with strong legs and a sharp inner claw, and can injure a person if cornered, provoked, or habituated to being fed. The standard guidance is to keep a safe distance and never feed them.
Can cassowaries fly?
No. Cassowaries are flightless ratites, related to emus, ostriches, and kiwis. They are adapted for moving through dense rainforest on foot rather than for flight.
Why are cassowaries important to the forest?
Cassowaries are key seed dispersers. By eating large fruits whole and moving through the forest, they spread the seeds of many rainforest plants — some of which depend on cassowaries to disperse and germinate effectively.

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.