Black Drongo
The black drongo (Dicrurus macrocercus) is a smaller Asian passerine fowl of the drongo loved ones Dicruridae. It is a prevalent resident breeder in substantially of tropical southern Asia from southwest Iran as a result of India and Sri Lanka east to southern China and Indonesia. It is a wholly black fowl with a distinctive forked tail and steps 28 cm (11 in) in length. It feeds on insects, and is prevalent in open up agricultural regions and light forest all through its selection, perching conspicuously on a bare perch or together electrical power or telephone traces. The species is recognised for its aggressive conduct in direction of much much larger birds, this sort of as crows, in no way hesitating to dive-bomb any chicken of prey that invades its territory. This conduct earns it the casual name of king crow. Smaller sized birds usually nest in the very well-guarded vicinity of a nesting black drongo. Formerly grouped together with the African fork-tailed drongo (Dicrurus adsimilis), the Asian types are now dealt with as a different species with numerous distinct populations.
The black drongo has been introduced to some Pacific islands, in which it has thrived and become considerable to the point of threatening and producing the extinction of indigenous and endemic fowl species there.
The black drongo was the moment deemed a subspecies of the fork-tailed drongo (Dicrurus adsimilis), a shut relative that diverged rather lately. The two are now regarded as distinctive species, with the fork-tailed drongo limited to Africa and separated from the Asian selection of the black drongo.
Seven subspecies have been named but the mainly contiguous populations clearly show clinal variation and intergrade with each other. People from northern India (ssp. albirictus) are larger sized than people from the Sri Lankan populace minor even though all those from the peninsular India (nominate subspecies) are intermediate in size. Race cathoecus is uncovered in Thailand, Hong Kong and China. This race has a a great deal scaled-down rictal location and the wings are dim with a greenish gloss. In southern Siam a race thai is resident, but overlaps with wintering cathoecus. Race javanus is observed on the islands of Java and Bali. Race harterti found in Formosa has the tail duration a lot less than the wing.
This fowl is shiny black with a wide fork to the tail. Older people commonly have a small white location at the base of the gape. The iris is dim brown (not crimson as in the identical ashy drongo). The sexes are unable to be instructed aside in the discipline. Juveniles are brownish and may possibly have some white barring or speckling to the stomach and vent, and can be mistaken for the white-bellied drongo. First-calendar year birds have white suggestions to the feathers of the belly, though second-several years have these white-tipped feathers restricted to the vent.
They are aggressive and fearless birds, and despite the fact that only 28 cm (11 in) in length, they will attack much greater species that enter their nesting territory, which include crows and birds of prey. This behaviour led to their previous title of king crow. They fly with sturdy flaps of the wing and are able of speedy manoeuvres that empower them to seize flying insects. With small legs, they sit upright on thorny bushes, bare perches or energy wires. They may well also perch on grazing animals.
They are capable of generating a large array of phone calls but a common connect with is a two take note tee-hee contact resembling that of the Shikra (Accipiter badius).
The black drongo is uncovered predominantly in open state and ordinarily perches and hunts shut to the floor. They are generally aerial predators of bugs but also glean from the floor or off vegetation. They are observed as summer season site visitors to northeastern Afghanistan and northern Pakistan but are people from the Indus Valley until eventually Bangladesh and into India and Sri Lanka. Some populations demonstrate seasonal actions that are improperly understood. The black drongo can be uncovered in savannas, fields, and city habitats.
Black drongos were introduced just just before the Second Entire world War from Taiwan to the island of Rota to enable in the command of insects. It is believed that they dispersed around the sea to the island of Guam in the 1950s. By 1967, they were the fourth most commonly viewed birds in roadside counts on Guam and are nowadays the most plentiful hen there. Predation by and competitiveness from black drongos have been proposed as elements in the decrease of endemic fowl species this sort of as the Rota bridled white-eye and the Guam flycatcher.
Remaining frequent, they have a wide variety of nearby names. The more mature genus title of Buchanga was derived from the Hindi title of Bhujanga. Other local names involve Thampal in Pakistan, Gohalo/Kolaho in Baluchistan, Kalkalachi in Sindhi, Kotwal (=policeman) in Hindi Finga in Bengali Phenshu in Assamese Cheiroi in Manipuri Kosita/ Kalo koshi in Gujarati Ghosia in Marathi Kajalapati in Oriya Kari kuruvi (=charcoal fowl), Erettai valan (=two tail) in Tamil Passala poli gadu in Telugu Kaaka tampuratti (=queen of crows) in Malayalam Kari bhujanga in Kannada and Kalu Kawuda in Sinhalese.[70] A superstition in central India is that cattle would eliminate their horn if a freshly fledged hen alighted on it. It is held in reverence in areas of Punjab in the perception that it introduced drinking water to Husayn ibn Ali, revered by Shī‘a Muslims.
Posted by siddharthx on 2018-01-31 15:44:59
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