Black Drongos become active very early at dawn and roost later than many other birds. They feed mainly on insects such as grasshoppers, cicadas, termites, wasps, bees, ants, moths, beetles and dragonflies. They sometimes fly close to tree branches, attempting to disturb any insects that may be present. They congregate in fields that are being ploughed, picking up exposed caterpillars and beetle grubs. As many as 35 birds have been seen at such congregations. They are also attracted to burning grasslands where insects are disturbed. They appear to avoid flies. They associate with Common Mynas, Cattle Egrets and other birds that share a similar diet and habitat. Drongos benefit from this association and are more successful in their foraging.

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