The Fork-Tailed Drongos are quite common throughout Africa, and I see them often. They also go by the name of African Drongo, Common Drongo or Savanna Drongo.
The birds are completely black with the male being a bit more glossy/shiny. It has red eyes and a big head, as indicated in the video below, and, of course, it has a forked tail from which it get its name
They are a small, but incredibly aggressive species, and will often attack bigger birds.
Fork-Tailed Drongo Size:
He is usually about 25cm long.
Fork-tailed Drongos Diet:
They eat insects which they either catch in flight or pick up from the ground.
I took a quick video of a Drongo eating a moth here.
Fork-Tailed Drongo Distribution Map
(Where it is found)