A video of a male Australian musk duck called Ripper has recently surfaced showing it saying what sounds like, “you bloody fool.”
The footage was actually recorded by birder Peter J. Fullagar in July 1987 and found many years later by scientist Carel ten Cate from Leiden University in the Netherlands.
Carel was writing a paper for the university and studying bird vocal learnings when he stumbled across an “obscure reference” to Ripper.
“When I read it at first I thought, ‘it’s a hoax, it can’t be true.’ But it turned out to be true,” he said, according to Huff Post.
According to his research paper, the duck was said to have learned the phrase from its caretaker when it lived at the Tidbinbilla Nature Reserve near Canberra in the late 1980s.
The waterbird was also said to have been able to mimic the sound of a slamming door.
Carel’s research about bird vocals was published on Monday in the peer-reviewed journal Philosophical Transactions of the Royal Society B: Biological Sciences.