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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.