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Aerodramus is a genus of small, dark, cave-nesting birds in the Collocaliini tribe of the swift family Apodidae.
The genus name combines the Ancient Greek aer meaning "air" with -dromos meaning "-racer" (from trekho "to run").

1/ Edible-nest swiftlet (Yến hông xám, Aerodramus fuciphagus), also known as the white-nest swiftlet

2/ Himalayan swiftlet (Yến núi, Aerodramus brevirostris) 

3/ Mossy-nest swiftlet (Yến rêu, Aerodramus salangana) 

Himalayan swiftlet 
(Yến núi, Aerodramus brevirostris) 

The Himalayan swiftlet (Aerodramus brevirostris) is a small swift of the swift family Apodidae.
This bird species is a common breeder in the Himalayas and Southeast Asia. Some populations are migratory.

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 combines the Ancient Greek aer meaning "air" with -dromos meaning "-racer" (from trekho "to run").
Brevirostris is Latin for "short-beaked". It combines the Latin words brevis ("short") and-rostris -billed (rostrum bill).

Mossy-nest swiftlet (Yến rêu, Aerodramus salangana) 

The mossy-nest swiftlet (Aerodramus salangana) is a species of swift in the family Apodidae.

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 combines the Ancient Greek aer meaning "air" with -dromos meaning "-racer" (from trekho "to run").
salangana: Possibly from Salangane was the name given by the inhabitants of the Philippines to a small type of swallow.

Edible-nest swiftlet 
(Yến hông xám, Aerodramus fuciphagus), also known as the white-nest swiftlet

The edible-nest swiftlet (Aerodramus fuciphagus), also known as the white-nest swiftlet, is a small bird of the swift family which is found in Southeast Asia.

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.

Aerodramus comes from two Ancient Greek words: aēr (ἀήρ), meaning "air," and dromos (δρόμος), meaning "path" or "runner". The name therefore translates to something like "air-path" or "air-runner," referring to swiftlets that navigate their environment through the air. 

The specific epithet fuciphaga combines the Ancient Greek φυκος/phukos meaning "seaweed" with -φαγος/-phagos meaning "-eating".