The Greater Racket-tailed Drongo (Dicrurus paradiseus) with its black plumage and red eyes has two distinctive, modified outer-tail feathers that have rackets at the tip, hence its name.
This native forest bird is commonly observed in forested areas throughout Thailand. 
It is a proficient imitator of the calls made by other birds.

Koh Lanta, Thailand, 27 January 2013