Gorsachius leuconotus (White Backed Night Heron) is a species of birds in the family Ardeidae. They are associated with freshwater habitat. They are found in Afrotropics.
Definition: The largest scale biogeographic division of the earth's surface based on the historic and evolutionary distribution patterns of plants and animals.
Comment: "Large" is ambiguous. For details on "Large rivers" (e.g. the Mekong river) see http://worldwildlife.org/biomes/large-river-ecosystems This class will be replaced with a less ambiguous class.
