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Black swan theory or a black swan event is a term used to describe a very rare or otherwise unexpected event that has a major effect. The term is based on an ancient saying which presumed black swans did not exist.
Portrait of a beautiful black swan (Cygnus atratus) surrounded by mute swans (Cygnus olor).
Majestic black swan
A close portrait of a  black swan
Black swan on the lake
Black Swan by the water’s edge
Black gooses are swimming on river with her child. Beauty in nature
Black swan family, black swan parents lead little swans foraging on the water
Black Swan bird upside down in water while foraging for food
The black swan by the lake
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Two black swans glide gracefully across a calm, reflective lake, creating a peaceful scene in the heart of nature. The still water mirrors their elegant forms and the surrounding lush greenery, evoking a sense of tranquility and balance.
the black swan is a black water bird with a red beak and white stripe
black swan swimming on lake inside iron mesh
Black Swan in Hyde Park, London
Black swan is swimming in the lake
Black swan in green water in Portugal
Black swan swimming in the lake
Portrait of a black swan. Bird with black plumage. Cygnus atratus. Waterbird.
close-up of a black swan in colorful water
the black swan has black feathers edged with white on its back and is all black on the head and neck.  It has a red beak with a white stripe and red eyes
A black swan paddling across a lake. Australia.
Black Swan swims on the water in a park, China
Portrait head of an adult black swan, Cygnus atratus. March 2022,Beijing, China.
Close-up of the head and body of a black swan on the shore
Black Swans have the longest neck to body ratio of any swan species. Their beak is deep red with white band at the tip, and they have black, webbed feet. Black Swans have no natural predators, but they may be preyed on by introduced species such as cats, dogs, and foxes.
Several black swans were swimming in the water
The dark sky in the lake with cute little geese
Close up of a elegant and beautiful black swan and white swans in background.
A majestic black swan gracefully spreads its wings on a serene lake, reflecting the tranquil beauty of nature. The dark plumage contrasts with the glistening water, creating a picturesque moment in the peaceful environment.
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