Drongos are a birds with quite a few distinctive features. Most notably are the Racquet-tailed species with the long streamers extending out from their fairly long tail. Other Drongos which are without streamers have the tail -forked. Next, these are birds with loud calls and in metallic tone. When they are around, you just cannot miss their presence, the loud calls in unique tones are repeated in close frequencies. Lastly, another general feature of these birds, is their glossy dark blue colored feathers.
Drongos are insect-eating birds. Most Drongos are found in the deep forest but the Greater Racquet-tailed Drongo do reach out at the forest edge with human traffic. The migrating Ashy Drongo sometimes do spend time in open field. Their legs are short and when perched maintains an upright position. whilst perched. They too remain in the same perch for long time, behaving like Shrikes. Most of the time their prey are in trees away from the ground. But I have posted one picture to show that they do hunt on the ground.
I have seen the Greater-racquet-tailed Drongo as an aggressive bird, individually or in group driving away larger bird like the House Crow. the same bird having a large repertoire also mimics calls.