About Calyptomena whiteheadi Sharpe, 1887
Whitehead's broadbill, with the scientific name Calyptomena whiteheadi Sharpe, 1887, is the largest species in the genus Calyptomena. This species measures 24–27 cm (9.4–10.6 in) in length; males weigh 142–171 g (5.0–6.0 oz) and females weigh 150–163 g (5.3–5.7 oz). Males have vivid green plumage, with some black coloring on the top of the head, black spots on the ear-coverts and the back of the neck, and a large black patch on the lower throat and upper breast. They also have extensive black markings on the wings and upper back, conspicuous streaking on the underparts, and blackish tails and flight feathers. Their irises are dark brown, their feet are olive to greyish-green, their bill is black with a pale lower mandible, and a large feather tuft on the forehead nearly covers the bill. Females are smaller than males, have a smaller forehead tuft, lack any black markings on the head, have duller green underparts, and do not have black streaking on their underparts. Juveniles resemble adults but have fewer black markings. This species can be distinguished from other species in its genus by its larger size, black throat, and more extensive black markings across the body. Whitehead's broadbill is endemic to Borneo, where it occurs in the northern and central regions of the island. It is likely found across the full length of the mountain range that runs through central Borneo from Mount Kinabalu to Kayan Mentarang and Mount Batu Timbang, though it is locally absent from some areas. It inhabits primary montane forest and forest edges, and prefers areas with taller tree growth. It is most common at elevations between 900–1,700 m (3,000–5,600 ft), but can be found as low as 600 m (2,000 ft) and as high as 1,980 m (6,500 ft). It does not migrate, but makes local movements based on the fruiting seasons of the trees it feeds on. Individuals have also been observed at 75 m (246 ft) elevation during severe droughts. In terms of behavior and ecology, Whitehead's broadbills usually perch silently, but are sometimes loud and conspicuous. Their average generation length is 4.2 years.
