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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.

Hirundapus is a genus of the swift family of birds in the family Apodidae, of the order Apodiformes.

1/ Silver-backed needletail (Yến đuôi cứng bụng trắng, Hirundapus cochinchinensis)

2/ White-throated needletail (Yến đuôi cứng họng trắng, Hirundapus caudacutus), also known as needle-tailed swift or spine-tailed swift
The specific name caudacutus comes from the Latin words cauda meaning "tail" and acutus meaning "pointed".

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

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 English name needletail is from the spined or thorny tail ends.

Silver-backed needletail 
(Yến đuôi cứng bụng trắng, Hirundapus cochinchinensis)

The silver-backed needletail (Hirundapus cochinchinensis) is a species of swift in the family Apodidae. 
The bird species is found in Southeast Asia, Sumatra, Java and Taiwan.

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 English name needletail is from the spined or thorny tail ends.
cochinchinensis: Latin for southern Vietnam.

White-throated needletail 
(Yến đuôi cứng họng trắng, Hirundapus caudacutus), also known as needle-tailed swift or spine-tailed swift

The white-throated needletail (Hirundapus caudacutus), also known as the needle-tailed swift or spine-tailed swift, is a large swift in the genus Hirundapus.

This bird species is a migratory bird, breeding in Central Asia and southern Siberia, and wintering south in the Indian Subcontinent, Southeast Asia and Australia.

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 English name needletail is from the spined or thorny tail ends.
The Latin term "caudacutus" combines the words cauda ("tail") and acutus ("sharp"), meaning "sharp-tailed".