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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 stone-curlew or great thick-knee (Rẽ mỏ to, Esacus recurvirostris)

The great stone-curlew or great thick-knee (Esacus recurvirostris) is a large wader, a resident breeder in tropical southern Asia from India, Pakistan, Sri Lanka, Bangladesh, South-east Asia.

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

Charadriiformes, Charadriidae, Charadrius: Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate; from Ancient Greek kharadrios a bird found in ravines and river valleys (kharadra, "ravine").

Burhinidae is a taxonomic family of birds (stone-curlews/thick-knees) derived from New Latin Burhinus and the suffix -idae. 

The name Esacus is from Ancient Greek aisakos an unidentified bird variously associated with a robin, a shorebird or a cormorant.

The specific epithet recurvirostris combines Latin recurvis meaning "bent backwards" with -rostris meaning "-billed".