Black-backed swamphen 
(Porphyrio indicus)

The black-backed swamphen (Porphyrio indicus) is a species of swamphen occurring from southeast Asia to Sulawesi and Borneo. 
This bird species used to be considered a subspecies of the purple swamphen, which it resembles, but has a large shield, black upperparts. 
Some birds have the sides of the head is blackish.

Gruiformes, Gruidae: from the Latin word grus meaning "crane".
Rallidae: from rallus new Latin for rail, an aquatic bird.
The genus name Porphyrio comes from the Ancient Greek word πορφυρίων (porphurion), derived from πορφυρα (porphura), which means "purple". 
The term was adopted into Latin and New Latin, referring to a type of "swamphen" or "purple water-hen," a bird characterized by its striking purple or reddish-purple plumage.