Any of a few nocturnal or crepuscular herons regarding the genus Nycticorax, particularly the black-crowned heron, N. nycticorax.
any one of several types of herons associated with genus Nycticorax, found in parts around the globe. The best known types is Nycticorax griseus, or Nycticorax nycticorax, of Europe, as well as the US variety (var. nævius). The yellow-crowned night heron (Nyctanassa violacea syn. Nycticorax violaceus) inhabits the Southern says.
A heron of crepuscular or notably nocturnal habits.