Brown-backed needletail 
(Yến đuôi cứng lớn, Hirundapus giganteus), or brown needletail

The brown-backed needletail (Hirundapus giganteus), or brown needletail, is a large swift of the swift family Apodidae.
These swifts are resident breeders in hill forests in southern Asia from India east to Indonesia and the Philippines.

As the name apodiforme—meaning "footless" in Greek—suggests, the legs of hummingbirds, swifts and treeswifts (or 'crested' swifts) are rather small and offer limited functional uses.
The family name, Apodidae, is derived from the Greek ἄπους (ápous), meaning "footless", a reference to the small, weak legs of these most aerial of birds.

The genus name Hirundapus is constructed from the names of the swallow genus Hirundo and the swift genus Apus.
Hirundo is a Latin word meaning swallow.
The word apus is Latin and derived from the Ancient Greek α, a ("without") and πளுக்கான, pous ("foot"), meaning "footless". 
The scientific epithet "Giganteus" is a Latin adjective meaning "gigantic," "of or belonging to the giants," or "like that of the Giants". It is directly derived from the Ancient Greek word gigas (γίγας), which also means "giant". Therefore, both the Latin and Greek roots point to a meaning of extraordinary size. 
The English name needletail is from the spined or thorny tail ends.