Asian openbill 
or Asian openbill stork 
(Cò nhạn, Cò ốc, Anastomus oscitans)

The Asian openbill or Asian openbill stork (Anastomus oscitans) is a large wading bird in the stork family Ciconiidae.

Ciconiiformes, Ciconiidae: from Latin ciconia for stork.
Anastomus: from the Ancient Greek anastomoō meaning "to furnish with a mouth" or "with mouth wide-opened".
The specific epithet oscitans is the Latin word for "yawning", oscitare to yawn, Bec-ouvert.

Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam
Asian openbill at Van Long Wetland Reserve in Ninh Binh Province, Vietnam

Vietnam Adventure Travel