Great Argus

Overview

The Great Argus inhabits dense lowland rainforest of Borneo, Sumatra, and the Malay Peninsula, and is renowned for the male's extraordinary secondary wing feathers, which can be raised and spread into a huge fan covered in eye-like spots during courtship display on a cleared forest floor "dancing ground."

Feather Identification

• Secondary wing feathers (male): greatly elongated, among the longest feathers of any bird, patterned with rows of large ocelli (eye-like spots) shaded to create a three-dimensional appearance
• Body feathers: finely patterned brown and buff with intricate spotting and vermiculation, providing camouflage on the forest floor
• Tail feathers: also elongated, contributing to the male's overall large size during display
• Female feathers: notably smaller and shorter, with a more subdued brown and buff pattern lacking the giant ocellated wing feathers
• Overall impression: the sheer size and ocelli pattern of the male's wing feathers make them unmistakable and unlike those of any other pheasant

Plumage Notes

Males possess dramatically elongated secondary wing and tail feathers patterned with large shaded eye-spots, used to form a spectacular fan during courtship display, while the rest of the body is finely patterned brown and buff for camouflage. Females are considerably smaller with shorter feathers and a more uniform brown pattern. Juveniles resemble females, with males gradually developing the elongated ocellated feathers over successive years and molts.

Habitat & Range

Great Argus inhabit dense, undisturbed lowland rainforest across Borneo, Sumatra, and the Malay Peninsula, requiring large tracts of mature forest. The species is non-migratory and highly sedentary, tied closely to forest interior habitat.

Behavior & Field Notes

Males clear a patch of forest floor as a display ground, where they perform an elaborate wing-fanning display accompanied by loud, far-carrying calls to attract females. Diet includes fallen fruit, seeds, and invertebrates foraged from the forest floor. Nests are simple ground scrapes in dense forest cover. The species is more often heard than seen, its distinctive loud calls carrying through the rainforest canopy.