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White-bellied drongo
The white-bellied drongo (''Dicrurus caerulescens'') is a species of drongo found only on the Indian Subcontinent in India, Nepal, Bangladesh and Sri Lanka. Like other members of the family Dicruridae they are insectivorous and is mainly black in colour but with a white belly and vent. Young birds are, however, all black and can be confused with the black drongo, although smaller and more compact in appearance, and the subspecies found in Sri Lanka has white restricted to the vent.
==Description==
This drongo is black without any glossy on the upperside and greyish on the throat and breast while the belly and vent are entirely white in the Indian form which is the nominate subspecies. The fork of the tail is less deep than in the black drongo which is often seen in the same habitats. Young black drongo's can have a lot of white on the underside but it is usually scaly in appearance. The Sri Lankan forms ''insularis'' of the northern dry zone and ''leucopygialis'' of the southern wet zone have the white restricted to the vent. Birds that are less than a year old lack the white on the underside but are browner above and greyish below.
The size of the birds varies clinally with northern birds larger. The extent of white on the underside also declines with size although there is a lot of local variation. The Sri Lankan forms ''leucopygialis'' and ''insularis'' are darker than the Indian form and there is some intergradation within the Sri Lankan forms.
The species is believed to be closely related to ''Dicrurus leucophaeus''〔 but has not be confirmed with molecular sequence studies.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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