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Coracias is a genus of the rollers, an Old World family of near passerine birds related to the kingfishers and bee-eaters.
The genus name is from Ancient Greek korakías (κορακίας), derived from korax (κόραξ, ‘raven, crow’).

1/ Indian roller (Sả rừng, Coracias benghalensis) 

2/ Indochinese roller, or Burmese roller
 (Coracias affinis) 
formerly considered as a subspecies of the Indian roller. 

Coraciidae is a family of Old World birds, which are known as rollers because of the aerial acrobatics some of these birds perform during courtship or territorial flights.

The name comes from the Latin language "corax", meaning "raven"

Eurystomus is a genus of roller, one of the two genera in that family of birds. The name means ‘broad mouth’, from the Greek eurus (‘broad, wide’) and stoma ( ‘mouth’).
1/ Oriental dollarbird (Yểng Quạ, Eurystomus orientalis)
Also known as Asian dollarbird, dark roller, dollar roller, dollarbird, eastern broad-billed roller and oriental broad-billed roller.