Since these two species are so similar and are found in roughly the same area, I am going to combine the profiles of the Greater & Lesser Racket-tailed Drongo (Dicrurus paradiseus & Dicrurus remifer). You can tell them apart by the size of the bird, the crest on the Greater RTD and the shape of the tails. The Greater has a fork shaped tail and the Lesser’s tail is more of a wedge shape.
This is a Lesser Racket-tailed Drongo from Mae Ping NP in Thailand with the smooth head and wedge-shaped tail.
Here is a Greater Racket-tailed Drongo with the forked tail in Taiping.
Both birds have a large, varied range in South-east Asia with the Greater having a larger distribution including India than the Lesser. I saw both birds in northern Thailand, in Doi Inthanon and Mae Ping, also in Taiping and Taman Negara in Malaysia.
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A Gretaer RTD in India.
And another one singing.
See how his tail floats while in flight!
And here’s a Lesser from Singapore.