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A black swan (Cygnus atratus) in Australia. The black swan theory or theory of black swan events is a metaphor that describes an event that comes as a surprise, has a major effect, and is often inappropriately rationalized after the fact with the benefit of hindsight. The term is based on a Latin expression which presumed that black swans did ...
The Northern Hemisphere species of swan have pure white plumage, but the Southern Hemisphere species are mixed black and white. The Australian black swan ( Cygnus atratus ) is completely black except for the white flight feathers on its wings; the chicks of black swans are light grey.
The black swan (Cygnus atratus) is a large waterbird, a species of swan which breeds mainly in the southeast and southwest regions of Australia. Within Australia, the black swan is nomadic, with erratic migration patterns dependent on climatic conditions. It is a large bird with black plumage and a red bill.
A grey swan is an event that is known and possible to happen, but which is assumed to be unlikely to occur. [1] The term derives from black swan theory, which describes an event which is unlikely but unknown. [1] In electrical engineering, gray swan refers to the kind of events that rarely happens but have great impact on power systems. [2]
The Black Swan: The Impact of the Highly Improbable is a 2007 book by Nassim Nicholas Taleb, who is a former options trader.The book focuses on the extreme impact of rare and unpredictable outlier events—and the human tendency to find simplistic explanations for these events, retrospectively.
A perfect storm led to Bayesian sinking, experts say. The combination of unlikely factors that could have contributed to the ship's fate constituted a "black swan event," Matthew Schanck, chairman ...
Unlike Black Swan events that are improbable and hard to predict, Gray Rhino events are highly probable and can often be mitigated with positive leadership action and change.
Young birds, called cygnets, are not the bright white of mature adults, and their bill is dull greyish-black, not orange, for the first year. The down may range from pure white to grey to buff, with grey/buff the most common. The white cygnets have a leucistic gene. Cygnets grow quickly, reaching a size close to their adult size in ...