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.
Read more about this topic: White-bellied Drongo
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