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Birds of Thailand

Species of Thailand

Grey peacock-pheasant

Thai: นกแว่นสีเทา, nok wan see thao

Binomial name: Polyplectron bicalcaratum, Carolus Linnaeus, 1758

The grey peacock-pheasant (Polyplectron bicalcaratum), also known as Burmese peacock-pheasant, is a large Asian member of the order Galliformes. It is the national bird of Myanmar.


It is a large pheasant, up to 76 cm long and greyish brown with finely spotted green eyespots, an elongated bushy crest, bare pink or yellow facial skin, white throat, and grey iris, bill and legs. The sexes are rather similar, but the female is smaller, darker and less ornamented than the male. The young resemble the female.

Distribution and ecology

The grey peacock-pheasant is distributed in lowland and hill forests of Northeast India and Southeast Asia, but excluding most of Indochina as well as the entire Malayan Peninsula. The diet consists mainly of seeds, termites, fruits and invertebrates. The female usually lays two eggs.

Status and conservation

Widespread throughout its large range, the grey peacock-pheasant is evaluated as a Species of Least Concern on the IUCN Red List of Threatened Species. It is listed on CITES Appendix II, restricting trade in wild-caught birds to preserve its stocks.


Three subspecies are recognized today as good, while an additional one is of unclear validity:

  • Polyplectron bicalcaratum bicalcaratum (Carolus Linnaeus, 1758) – Common grey peacock-pheasant
  • Polyplectron bicalcaratum ghigii (Jean Théodore Delacour & Pierre Jabouille, 1924) – Ghigi's grey peacock-pheasant
  • Polyplectron bicalcaratum bailyi (Percy Roycroft Lowe, 1925) – Lowe's grey peacock-pheasant (disputed)
  • Polyplectron bicalcaratum bakeri (Percy Roycroft Lowe, 1925) – Northern grey peacock-pheasant

One previous subspecies, the Hainan peacock-pheasant (P. b. katsumatae), has since been given approved species (AS) status by the IOC.

Lowe's grey peacock-pheasant was described from a captive bird of unknown provenance. Similar examples have turned up on occasion, but the validity and – if distinct – home range of this taxon remains unknown. It was theorized to inhabit western Assam or the eastern Himalayas, but this is based on conjecture.

The phylogeny of this species is fairly enigmatic. mtDNA cytochrome b and D-loop as well as the nuclear ovomucoid intron G sequence data confirms that it belongs to a largely Continental Asian clade together with Germain's peacock-pheasant (P. germaini), but also the "brown" southern species bronze-tailed peacock-pheasant (P. chalcurum) and mountain peacock-pheasant (P. inopinatum).

The ovomucin sequence seems to have evolved convergently or with a decreased mutational rate on the grey and the bronze-tailed peacock-pheasant. Though they are quite similar on the molecular level, the distance and interspersed populations of their closest relatives argue against a much more recently shared common ancestry between them versus the other two "northern" peacock-pheasants. Also, the cytochrome b and D-loop data does not support a closer relationship between P. bicalcaratus and P. chalcurum; overall, as it seems the four species' ancestors separated during a very short timespan.

Note however that in the absence of dedicated phylogeographic studies, the molecular data is only of limited value in this species, the most morphologically diverse and widespread peacock-pheasant: There is no data on the origin and number of specimens, but it is unlikely that more than one or two individuals – possibly of captive origin and undeterminable subspecific allocation – were sampled. All that can be reasonably assumed is that the grey peacock-pheasant evolved on mainland Southeast Asia, probably during the Late Pliocene to Early Pleistocene 3.6-1 million years ago.

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Scientific classification

Polyplectron bicalcaratum

Common names

  • English: Grey eacock-pheasant
  • Thai: นกแว่นสีเทา, nok wan see thao


  • Polyplectron bicalcaratum bailyi, Percy Roycroft Lowe, 1925

    Range: Lowe's grey peacock-pheasant (disputed)

  • Polyplectron bicalcaratum bakeri, Percy Roycroft Lowe, 1925

    Range: Northern grey peacock-pheasant

  • Polyplectron bicalcaratum bicalcaratum, Carolus Linnaeus, 1758

    Common name: Common grey peacock-pheasant

  • Polyplectron bicalcaratum ghigii, Jean Théodore Delacour & Pierre Jabouille, 1924

    Common name: Ghigi's grey peacock-pheasant

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)

Grey peacock-pheasant

Grey peacock-pheasant

Creative Commons Attribution-ShareAlike 4.0 International Thai National Parks

Grey peacock-pheasant

Grey peacock-pheasant


Distribution map of Grey peacock-pheasant, Polyplectron bicalcaratum in Thailand

Range map of Polyplectron bicalcaratum in Thailand

Important note; our range maps are based on limited data we have collected. The data is not necessarily accurate or complete.

Special thanks to Ton Smits, Parinya Pawangkhanant, Ian Dugdale and many others for their contribution for range data.

It is free to use this map on various media. See the creative common license terms by clicking "CC" icon below the map. But remember, again; the map may not be accurate or complete.

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