The night herons are medium-sized herons in the genera Nycticorax and Gorsachius. The genus name Nycticorax derives from the Greeks for “night raven” and refers to the largely nocturnal feeding habits of this group of birds, and the croaking crow-like call of the best known species, theBlack Crowned Night Heron. These herons are migratory outside the tropical parts of their ranges-wiki