Introduction
The Great Argus (Argusianus argus) is a large, ground-dwelling pheasant of the tropical forests of South-east Asia. It is renowned for the male’s extraordinary courtship display, during which his greatly elongated wing and tail feathers form a broad fan patterned with eye-like ocelli. The species is resident rather than migratory and is often treated as having two subspecies, the Malay-Sumatra Great Argus and the Bornean Great Argus.
Physical Description
The Great Argus is a large, mainly brown pheasant with a blue-grey head and neck, a reddish-brown upper breast, reddish legs and intricately patterned plumage. The male has enormous, broad secondary wing feathers marked with large iridescent ocelli, as well as two elongated central tail feathers. These feathers are specialised for display rather than efficient flight.
Males may approach 2 metres in total length when the long tail is included. The central tail feathers can reach approximately 1.43 metres. Adult males average about 2.35 kg, although size varies between individuals and populations. Females are smaller, averaging about 1.59 kg, and lack the male’s extremely elongated display feathers and conspicuous ocelli. Their browner, less elaborate plumage provides better camouflage on the forest floor.
Young birds resemble females. Males acquire their full adult display plumage gradually, with mature male plumage developing over several years.
Range and Habitat
The Great Argus is distributed across the Sunda Shelf, including the Malay Peninsula, Sumatra and Borneo. It occurs in Malaysia, Indonesia and parts of southern Thailand. The species is resident and does not undertake regular long-distance migration.
It is principally associated with lowland and hill forests, generally below about 1,200 metres. Primary forest and mature secondary forest are particularly important, especially where large trees, a developed leaf-litter layer and a relatively open understorey are present. Display grounds are usually established in forest with limited ground vegetation and enough open space for the male’s courtship performance.
Although the species can occur in old secondary forest, studies indicate that it is strongly associated with intact or lightly disturbed habitat. It is less likely to persist in small, isolated or heavily degraded forest fragments.
Behaviour and Diet
Great Argus are usually secretive and difficult to observe despite their size and distinctive calls. They forage mainly on the forest floor, often alone, searching through leaf litter for food. Their omnivorous diet includes fruit, seeds, flowers, leaf buds, nuts and invertebrates such as ants and other leaf-litter arthropods.
Males maintain display sites, sometimes called dancing grounds, which they clear of leaves and debris. The species has a polygynous mating system in which males advertise from separate display sites. During courtship, the male calls, moves around the female and raises his long tail feathers while spreading the large, ocellated wing feathers around his body. Rhythmic movements and wing vibrations draw attention to the eye-like patterns.
Breeding information from the wild remains limited. Nest records and observations indicate that the usual clutch contains two eggs, although the timing of breeding varies geographically and may extend across several months. The female incubates the eggs and raises the young. Chicks are precocial, leaving the nest soon after hatching and following the female while foraging.
Identification Tips
- Look for a large, brown forest pheasant with a blue-grey head and reddish legs.
- A displaying male is unmistakable: he raises the long central tail feathers and spreads broad wings covered in large, eye-like ocelli.
- Outside the display, males can appear surprisingly plain because the most spectacular feathers are folded and partly concealed.
- Females are smaller, duller and shorter-tailed, with more uniform brown plumage.
- The species is usually detected by its loud, penetrating call or by tracks and other signs rather than by prolonged views.
- Do not confuse the Great Argus with the crested arguses of the genus Rheinardia. Those species have a different crest and display structure and occur in different parts of mainland South-east Asia.
Conservation Status
The Great Argus is currently assessed as Vulnerable on the IUCN Red List. Its principal threats are the loss, degradation and fragmentation of lowland and hill forest through logging, agricultural expansion, infrastructure development and settlement. Hunting and trapping also affect some populations, and pressure may be increased where feathers are collected or used in traditional cultural items.
The species’ strong preference for intact forest makes it vulnerable to the loss of large, connected habitat blocks. Research in Sumatra has also shown that local abundance can fluctuate substantially, making short-term population counts difficult to interpret. Conservation measures include protecting remaining lowland and hill forests, maintaining habitat corridors, reducing hunting pressure, improving enforcement and monitoring populations with camera traps and acoustic surveys.
Frequently Asked Questions
Where does the Great Argus live?
The Great Argus lives in tropical forests of the Malay Peninsula, Sumatra and Borneo, including parts of Malaysia, Indonesia and southern Thailand.
Is the Great Argus migratory?
No. The Great Argus is considered a resident species. It makes local movements within its forest habitat but does not undertake regular long-distance migration.
How large is a male Great Argus?
A male may approach 2 metres in total length when the tail is included. Much of this length comes from the elongated central tail feathers, which can reach about 1.43 metres.
What does the Great Argus eat?
It eats a varied omnivorous diet of fruit, seeds, flowers, leaf buds, nuts and forest-floor invertebrates, including ants and other arthropods.
How does the male attract a mate?
The male clears a display ground and performs an elaborate courtship display. He spreads his large, ocellated wing feathers, raises his tail and uses calls and rhythmic movements to attract a female.
Why is the Great Argus threatened?
The main threats are forest clearance, logging, habitat fragmentation, hunting and trapping. The species is particularly sensitive to the loss of mature, relatively undisturbed forest.
References
- BirdLife International. n.d. “Great Argus Argusianus argus Species Factsheet.” BirdLife DataZone. Accessed 8 September 2026. https://datazone.birdlife.org/species/factsheet/great-argus-argusianus-argus
- Clink, D. J., T. Groves, A. H. Ahmad and H. Klinck. 2021. “Not by the light of the moon: Investigating circadian rhythms and environmental predictors of calling in Bornean great argus.” PLOS ONE 16(2): e0246564. https://doi.org/10.1371/journal.pone.0246564
- Kinnaird, M. F., T. G. O’Brien, E. S. Wibowo, A. B. Rijksen and T. Supriatna. 2003. “A fragmented landscape in southern Sumatra.” In T. G. O’Brien and M. F. Kinnaird, eds., Cuckoo-shrikes, Drongos and Other Birds of the Forests of Sumatra. Wildlife Conservation Society Indonesia Program.
- O’Brien, T. G. and M. F. Kinnaird. 2008. “Movements, Distribution, and Abundance of Great Argus Pheasants (Argusianus argus) in a Sumatran Rainforest.” The Auk 126(2): 341–350. https://doi.org/10.1525/auk.2009.07085
- International Ornithologists’ Union. 2026. “Great Argus, Argusianus argus.” IOC World Bird List, current master list. Accessed 8 September 2026. https://www.worldbirdnames.org/new/ioc-lists/master-list-2/
- International Union for Conservation of Nature. n.d. “Argusianus argus.” The IUCN Red List of Threatened Species. Accessed 8 September 2026. https://www.iucnredlist.org/search?query=Argusianus%20argus&searchType=species
- National Aviary. n.d. “Great Argus.” Our Animals. Accessed 8 September 2026. https://www.aviary.org/birds-habitats/our-birds/?search=Great+Argus
- World Bird Names. n.d. “Great Argus, Argusianus argus.” Accessed 8 September 2026. https://www.worldbirdnames.com/bird/great-argus/1159.html
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