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Botaurus is a genus of bitterns, a group of wading bird in the heron family Ardeidae.

Pelecaniformes, Pelecanus: Greek pelekan, pelekanos pelican.
Ardeidae, Ardea: Latin word meaning "heron".
The genus name Botaurus is derived from Medieval Latin butaurus, Bos (ox) and taurus (bull), because the bittern's call resembles the bellowing of a bull.

1/  Eurasian bittern or great bittern (Vạc rạ, Botaurus stellaris)
The species name stellaris is Latin for "starred", from stella, "star", and refers to the speckled plumage.

Butor étoilé
Eurasian bittern 
or great bittern 
(Vạc rạ, Botaurus stellaris)

Le Butor étoilé (Botaurus stellaris) est une espèce d'oiseaux échassiers de la famille des ardéidés (hérons, aigrettes), ou Ardeidae.

Pelecaniformes, Pelecanus: mot grec pelekan, pelekanos pelican.
Ardeidae, Ardea: mot latin pour "heron".
Botaurus: mot du latin médiéval butaurus, Bos (ox) et taurus (taureau). 
stellaris: mot latin pour "étoilé", vient du mot stella, "étoile", se référant au plumage moucheté/tacheté.

Eurasian bittern 
or great bittern 
(Vạc rạ, Botaurus stellaris)

The Eurasian bittern or great bittern (Botaurus stellaris) is a wading bird in the bittern subfamily (Botaurinae) of the heron family Ardeidae.

Pelecaniformes, Pelecanus: Greek pelekan, pelekanos pelican.
Ardeidae, Ardea: Latin word meaning "heron".
Botaurus: derived from Medieval Latin butaurus, Bos (ox) and taurus (bull). 
stellaris: Latin for "starred", from stella, "star", and refers to the speckled plumage.