Black Drongo is a glossy black bird of 28-cm (11 inch) in length with a wide fork to the tail. Adults usually have a small white spot at the base of the gape. They are aggressive and fearless birds. Black drongos become active very early at dawn and roost later than many other birds. Black drongos breed mainly in February and March in Southern India and until August in other parts of the country.

Males and females sing in the mornings during the breeding season. Black Drongo are common resident bird in much of Tropical southern Asia from Southwest Iran through India and Sri Lanka east to southern China and Indonesia. Their habitats are open agricultural areas and forest throughout its range, perching conspicuously on a bare perch or along power or telephone lines. Drongos feed mainly on insects such as grasshoppers, cicadas, termites, wasps, bees, ants, moths, beetles and dragonflies. For reproduction Males and females sing in the mornings during the breeding season.

Courtship can include aerobatic chases and they may lock their wings and beaks together, with the pair sometimes falling to the ground. Displays may be made on the ground. Pair bonds are retained for a whole breeding season. The nest is a cup made with a thin layer of sticks placed in the fork of branch, and is built in a week by both the male and female. Eggs are laid close to the first rains in April. Black Drongo has powerful and varied calls. They include scrapings and raucous calls, also metallic sounds. Call is a harsh, throaty "schweep-schweep". But we can also hear beautiful and clear whistles. Habit of Drongos preying on bees makes them a nuisance to bee-keepers, but farmers attract them to their fields using artificial perches in fields to encourage them to feed on pest insects. A superstition in central India is that cattle would lose their horn if a newly fledged bird alighted on it.