Indian Paradise-flycatcher ( Terpsiphone paradisi paradisi).
The male is a beautiful sight with two white tail streamers, a white body and a black head. This is the migrant race which occupies much the same habitat as the local race. Most likely seen in good forest in the lowlands, in both the dry and wet zones, but occasionally visits gardens.
I had a golden opportunity to capture an image of this Migrant species at the Home garden at Oru Bendi Siyambalawa - Bakamoona - Sri Lanka.
I used my Nikon D 7100 + NIKKOR 200 - 500mm. Super Telephoto Lens to get this beautiful bird life image.