Black Drongo
The black drongo (Dicrurus macrocercus) is a compact Asian passerine chicken of the drongo spouse and children Dicruridae. It is a prevalent resident breeder in a lot 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 hen with a distinct forked tail and steps 28 cm (11 in) in duration. It feeds on insects, and is typical in open agricultural parts and light-weight forest through its vary, perching conspicuously on a bare perch or along ability or telephone strains. The species is known for its intense conduct toward significantly larger birds, this kind of as crows, never ever hesitating to dive-bomb any fowl of prey that invades its territory. This behaviour earns it the informal name of king crow. More compact birds typically nest in the nicely-guarded vicinity of a nesting black drongo. Earlier grouped alongside with the African fork-tailed drongo (Dicrurus adsimilis), the Asian varieties are now dealt with as a independent species with quite a few unique populations.
The black drongo has been released to some Pacific islands, where by it has thrived and come to be ample to the point of threatening and producing the extinction of native and endemic fowl species there.
The black drongo was after considered a subspecies of the fork-tailed drongo (Dicrurus adsimilis), a near relative that diverged reasonably a short while ago. The two are now considered distinctive species, with the fork-tailed drongo restricted to Africa and separated from the Asian vary of the black drongo.
Seven subspecies have been named but the largely contiguous populations present clinal variation and intergrade with each and every other. Men and women from northern India (ssp. albirictus) are larger than people from the Sri Lankan inhabitants insignificant while people from the peninsular India (nominate subspecies) are intermediate in measurement. Race cathoecus is identified in Thailand, Hong Kong and China. This race has a a great deal scaled-down rictal spot 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 uncovered in Formosa has the tail length fewer than the wing.
This hen is shiny black with a large fork to the tail. Grown ups normally have a smaller white place at the foundation of the gape. The iris is darkish brown (not crimson as in the equivalent ashy drongo). The sexes are not able to be advised apart in the discipline. Juveniles are brownish and may well have some white barring or speckling towards the tummy and vent, and can be mistaken for the white-bellied drongo. To start with-12 months birds have white ideas to the feathers of the tummy, when second-a long time have these white-tipped feathers limited to the vent.
They are intense and fearless birds, and although only 28 cm (11 in) in size, they will assault significantly more substantial species that enter their nesting territory, like crows and birds of prey. This conduct led to their former identify of king crow. They fly with robust flaps of the wing and are able of speedy manoeuvres that empower them to seize traveling bugs. With limited legs, they sit upright on thorny bushes, bare perches or electric power wires. They may possibly also perch on grazing animals.
They are able of making a broad variety of calls but a frequent call is a two observe tee-hee simply call resembling that of the Shikra (Accipiter badius).
The black drongo is identified predominantly in open up country and ordinarily perches and hunts close to the floor. They are mostly aerial predators of bugs but also glean from the floor or off vegetation. They are observed as summertime visitors to northeastern Afghanistan and northern Pakistan but are residents from the Indus Valley until eventually Bangladesh and into India and Sri Lanka. Some populations display seasonal actions that are badly comprehended. The black drongo can be located in savannas, fields, and urban habitats.
Black drongos were being introduced just prior to the 2nd Environment War from Taiwan to the island of Rota to support in the manage of bugs. It is considered that they dispersed about the sea to the island of Guam in the 1950s. By 1967, they ended up the fourth most frequently noticed birds in roadside counts on Guam and are now the most abundant fowl there. Predation by and competitiveness from black drongos have been proposed as aspects in the decline of endemic chicken species these as the Rota bridled white-eye and the Guam flycatcher.
Currently being widespread, they have a large variety of community names. The more mature genus identify of Buchanga was derived from the Hindi title of Bhujanga. Other community names contain 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 chicken), 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 chicken alighted on it. It is held in reverence in components of Punjab in the perception that it brought drinking water to Husayn ibn Ali, revered by Shī‘a Muslims.
Posted by siddharthx on 2018-01-31 15:44:57
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