Australian native birds,first sighted by Europeans in 1697 by de Vlaming in West-Australia.
The Black Swan's prefers a habitat extends across fresh, brackish and salt water lakes, swamps
and rivers with underwater and emergent vegetation for food and nesting materials.

Definition of 'Black Swan Theory' of Taleb
An event or occurrence that deviates beyond what is normally expected of a situation and that would be extremely difficult to predict.