Trogone del Malabar

Identificazione

Like most other trogons, these birds are brightly coloured and sexually dimorphic. The male has a slaty black head and breast with a white border to the black bib separating it from the crimson on the underside. The back is olive-brown to chestnut. The wing coverts are black with fine white vermiculations. They have 12 tail feathers that are graduated. The central tail-feathers are chestnut with a black tip, with the second and third pairs from the middle having more black than chestnut. The outer three pairs have long white tips. The female lacks the contrasting black and crimson and has only a slightly darker head and breast that shades into the olive brown on the back while the crimson of the underside of the male is replaced by ochre. In both sexes, the beak is bluish as is the skin around the eye. The iris is dark brown and the feet are pale bluish. The nostrils are covered by tufts of filoplumes. The feet are heterodactyl, a feature unique to the trogons, with the digits I and II facing back and digits III and IV pointing forward. In most birds I, II and III face forward while IV faces back and in zygodactyly II and III face forward while I and IV face backwards.<p>Several populations have been named. The central Indian subspecies legerli, named by Walter Norman Koelz on the basis of a single specimen obtained from the foot of Mahendra Giri in Orissa is not always recognized, but said to be slightly larger, longer winged and brighter than malabaricus of the Western Ghats. The nominate race found in the central wet zone of Sri Lanka is smaller and the upperparts are brighter.

Tassonomia

Nome scientifico

Harpactes fasciatus

Autorità

(Pennant, 1769)

Ordine

Trogoniformes

Famiglia

Trogonidi

Genere

Harpactes

Areale e habitat

Migrazione

Resident species

Comportamento

These birds usually perch still, especially when alarmed and will sometimes clinging laterally to branches. When calling they sometimes raise and lower their tail. The call is a series of guttural or purring notes. The song of the male is a series of percussive kyau calls. The breeding season in India is mainly February to May (before the Monsoons) while it is March to June in Sri Lanka. <p>When they sit still, the appear hunched. The Hindi name used by hunters is kafni churi and refers to the hunched neckless appearance as if dressed in a fakir's kafni (robe). The Marathi name is karna while it is called kakarne hakki in Kannada. In Kerala it is known as theekakka (literally "fire-crow"). In Sri Lanka, it is known as loha wannichcha.[what language is this?][citation needed]<p>Malabar trogons feed exclusively on insects and fruits have not been noted in their diet unlike in the New World trogons. Seeds have however been reported in the diet of Sri Lankan specimens. In the forests of Sri Lanka, they are often found in mixed-species foraging flocks where they may sometimes be subject to kleptoparasitism by drongos. A study in Kerala found that they foraged mainly at 5 to 10 m with females tending to forage lower within the canopy. When foraging on bark, they propped themselves using their tail like woodpeckers, especially on decaying tree stumps. They sometimes descend to the ground and search for insects under leaf litter. They will sometimes fly and try to flush prey and then hover to pick up prey. They may also hang upside down to reach prey on vertical tree surfaces. Prey are often mashed or struck on a branch between the mandibles before feeding on them or prior to feeding young. The contact call is a series of about five low intensity que while these were of higher intensity in territorial fights. The alarm call is a churrrr and a similar call is also delivered prior to roosting. Although their flight is fast, they are reluctant to fly. In the Nilgiri hills they are altitudinal migrants and are found in the higher reaches only during summer. <p>The nest is made in rotting trees or stumps that are easy to carve and pulverize using their bills. The male and female take turns to excavate the nest using their bills. It may take about a month to excavate the nest. The floor is made out of the wood powder and no extra lining is added. Two eggs were seen to be the normal clutch in a study in Kerala although older works suggest that the typical clutch is of three eggs. The eggs are laid with a gap of two days and incubated by both males and females with the females usually incubating at night. The incubation period is about 19 days. The hatchlings are fed mainly caterpillars for the initial period and later provided bugs, flies and orthopterans. The parents do not remove the excreta of the nestlings from the nest. The adults continue to feed the fledged juveniles for nearly 5 to 6 months. They are socially monogamous with pair bonds lasting more than a season.<p>Sri Lankan birds have been seen to plunge into water from an overhanging branch to bathe.<p>A species of endoparasitic cestode, Triaenorhina burti has been described from the species.

Conservazione

Tendenza della popolazione

stable