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).