black swan
Cygnus atratus

Then he saw what the black swan had done to his horse.

But I can't help feeling that there's a black swan lurking.

Black Swan was born a princess on an alternate earth.

Free money, so long as you can bear the occasional black swan and don't go nuts.

There was a tattoo of a black swan on his left ankle.

I don't think you will find a black swan in the conclusions we have reached.

In any event, you won't want to miss the haunting black swans.

Our system of rewards is not adapted to black swans.

The gifts also included some black swans, but these had died on the voyage.

See the two white swans instead of the one black one.