Nycticorax is a genus of night herons. The name Nycticorax means "night raven" originating from the Ancient Greek: nuktos "night" and korax, "raven". 
the night herons of the genera Nyctanassa and Gorsachius were formerly placed in Nycticorax.

1/ Black-crowned night-heron (Vạc, Nycticorax nycticorax), or black-capped night-heron, commonly shortened to just night-heron