The night heron.
night heron definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of several herons most active at night or twilight
night heron definition by American Heritage Dictionary
Any of several nocturnal or crepuscular herons of the genus Nycticorax, especially the black-crowned heron, N. nycticorax.