About Harpactes whiteheadi Sharpe, 1888
Like most trogons, Whitehead's trogon (Harpactes whiteheadi Sharpe, 1888) is sexually dimorphic, with males being far more colorful than females. It is one of the largest trogon species found on Borneo, ranging from 29 to 33 cm (11 to 13 inches) in total length. For adult males, the forehead, crown, nape, and sides of the head are crimson, with bare blue skin surrounding the eyes. The rest of the male's upperparts are cinnamon-brown. The male has a black throat that fades into a grey breast, while all other underparts are crimson. The male's wings are mainly black, with fine white barring on the secondaries and coverts. The underside of the male's tail is mostly white. On the upper side, the two central tail feathers are cinnamon with a broad black tip, and the rest of the tail feathers are primarily black. The outermost tail feathers have white on the terminal half and along the outer web. Males also have a blue beak, pinkish-brown legs and feet, and reddish-brown irises. Adult females share the same overall pattern as males, but their plumage is much duller, and all areas that are crimson on males are cinnamon-brown on females. The barring on females' secondaries and wing coverts is cinnamon-brown instead of white. Immature females resemble adult females, but their entire ventral side is uniformly colored, and they lack the adult female's black throat and grey upper breast. Immature females also have less blue coloration on their beaks. Whitehead's trogon is endemic to the island of Borneo, where it lives in mountainous areas at elevations between 900 and 2,000 metres (3,000 and 6,600 ft). It is restricted to primary forest, and prefers damp valleys. It is an uncommon, poorly studied resident species.
