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Burhinidae is a bird family which is often known as stone-curlews, or dikkops or thick-knees.
The family contains three genera: Hesperoburhinus, Burhinus and Esacus. The name Burhinus combines the Ancient Greek bous meaning "ox" and rhis, rhinos meaning "nose" (or "bill").

The stone-curlews are not closely related to the curlews, genus Numenius, that belong to the sandpiper family Scolopacidae.

Burhinus is a genus of birds in the family Burhinidae. The genus name Burhinus comes from the Greek bous for ox, and rhis for nose.

1/ Eurasian stone-curlew, Eurasian thick-knee, or simply stone-curlew (Burhinus oedicnemus) 
The species epithet oedicnemus combines the Greek oidio meaning "to swell", and kneme meaning "shin" or "leg".

Esacus is a genus of bird in the stone-curlew family Burhinidae. The genus contains two species: the great stone-curlew and the beach stone-curlew.
The name is from Ancient Greek aisakos an unidentified bird variously associated with a robin, a shorebird or a cormorant.

1/ Great stone-curlew or great thick-knee (Rẽ mỏ to, Esacus recurvirostris)
The specific epithet recurvirostris combines Latin recurvis meaning "bent backwards" with -rostris meaning "-billed".

Great Thick-knee (Great stone-curlew) (Esacus recurvirostris, Rẽ mỏ to) belongs to Burhinidae family, Esacus genus.

The bird is a visiting winter bird, uncommonly sighted at the Xuan Thuy National Park.