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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.

Oriental Dollarbird
Also known as Asian dollarbird, dark roller, dollar roller, dollarbird, eastern broad-billed roller and oriental broad-billed roller.
(Yểng Quạ, Eurystomus orientalis)

The Oriental dollarbird (Eurystomus orientalis) is a bird of the roller family Coraciidae.

Coracia, Coracias: Greek: korakias: crow (korax raven).
The name Eurystomus means ‘broad mouth’, from the Greek eurus (‘broad, wide’) and stoma ( ‘mouth’).