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Hydrornis is a genus of pitta in the family Pittidae.  
Formerly merged with the genus Pitta, but a 2006 study split the family into three genera.
Latin hydr-, hydro-, from Greek, from hydōr

1/ Eared pitta (Đuôi cụt nâu, Hydrornis phayrei) 
Phayrei - fairy???
rei-
Proto-Indo-European root meaning "to flow, run."

2/blue-rumped pitta ( Đuôi cụt đầu xám, Hydrornis soror)
The specific epithet soror is Latin for "sister" (that is "closely related").

3/ Bar-bellied pitta (Đuôi cụt bụng vằn, Hydrornis elliotii)

Pittas are a family, Pittidae, of passerine birds found in Asia, Australasia and Africa.

Rusty-naped pitta
(Hydrornis oatesi)
Đuôi cụt đầu hung

The rusty-naped pitta (Hydrornis oatesi) is a species of bird in the family Pittidae.