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The drongos are a family, Dicruridae, of passerine birds and 31 species in the family are placed in a single genus, Dicrurus.

1/ Black Drongo (Chèo bẻo, Dicrurus macrocercus)
2/ Hair-crested drongo (Chèo bẻo bờm, Dicrurus hottentottus)
3/ Lesser racket-tailed drongo (Chèo bẻo cờ đuôi bằng, Dicrurus remifer)
4/ Greater racket-tailed drongo (Chèo bẻo cờ đuôi chẻ, Dicrurus paradiseus)
5/ Crow-billed drongo (Chèo bẻo mỏ quạ, Dicrurus annectens) 
6/ Bronzed drongo (Chèo bẻo rừng, Dicrurus aeneus)
7/ Ashy drongo (Chèo bẻo xám, Dicrurus leucophaeus)

Greater Racket-Tailed Drongo 
(Chèo bẻo cờ đuôi chẻ, Dicrurus paradiseus)

The greater racket-tailed drongo (Dicrurus paradiseus) is a medium-sized Asian bird which is distinctive in having elongated outer tail feathers with webbing restricted to the tips. 

Dicrurus is derived from the Greek words dikros meaning forked, ouros meaning tailed.
Paradisaea / paradisaea / paradisea / paradiseus / paradisi Late L. paradisus paradise: Greek paradeisos paradise, pleasure ground of the Persian kings.