The black swan was introduced to various countries as an ornamental bird in the 1800s, but has managed to escape and form stable populations.
The black swan is common in the wetlands of southwestern and eastern Australia and adjacent coastal islands.
The black swan was once thought to be sedentary, but is now known to be highly nomadic. There is no set migratory pattern, but rather opportunistic responses to either rainfall or drought. In high rainfall years, emigration occurs from the south west and south east into the interior, with a reverse migration to these heartlands in drier years. When rain does fall in the arid central regions, black swans will migrate to these areas to nest and raise their young. However, should dry conditions return before the young have been raised, the adult birds will abandon the nests and their eggs or cygnets and return to wetter areas.
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