The image above, from a postcard dated to circa 1910, is a beautiful and charming snapshot of a family day out and about in the beautiful Sydney Botanic Gardens. Today, on family days such as this, we often think of feeding ducks (though many councils request people do not do so), but in the image above the bird being fed by the children is the magnificent Native Black Swan.

The black swan is a majestic and interesting bird. Most famously it is the emblem associated with Western Australia, but the Black Swan is actually native to many areas of Australia. As such a large and beautiful bird, they also have a long history of being found in zoo’s and bird collections, and for many years they were also a popular part of public parks and gardens – like the Sydney Botanic Gardens.

Yet what is perhaps of most interest is what the phrase ‘black swan’ has come to mean. A black swan is a metaphor for an event or discovery which is unprecedented, unexpected and surprising but which in hindsight, really isn’t such a surprise after all. The phrase actually comes from the Latin and the oldest known use of the metaphor came almost a thousand years ago, in Juvenal’s line “rara avis in terries nigroque simillima cygno” which translates to “a rare bird in the lands and very much like a black swan”. At the time, and for centuries after, the only swans known were white swans, so it was assumed that the black swan did not exist. Then, in 1697, Willem de Vlamingh, a Dutch explorer, discovered black swans in Australia, proving they did exist after all. This came as a great surprise, but in hindsight many acknowledged that it really shouldn’t have been such a shock – just as other animals came in other colours, not all swans were white. Today, Black Swan Theory, as introduced by Nassim Nicholas Taleb in 2007 is well known, but it all traces back to these majestic if unexpected birds which are such a feature of the Australian landscape.