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The Black-crowned Night Heron (Nycticorax nycticorax), more commonly known as Night Heron, is a medium sized heron in the family Ardeidae which is in the genus Nycticorax. It is the most widespread heron in the world but is absent from large parts of North Africa, Northern Eurasia and Australasia as well as the more northern and colder regions. There are four subspecies or races generally recognised. The northern populations are migratory and winter in the southern parts of the range.