WTF Fun Fact – Aztec Death Whistle

The Aztec’s created a whistle in the shape of skulls called a death whistle. It produces a horrifying sound but its exact purpose is unknown. Experts think they may have been used during battle or as part of sacrificial ceremonies. – WTF Fun Facts

Source: https://www.dailymail.co.uk/sciencetech/article-2857363/Listen-terrifying-sound-Aztec-DEATH-WHISTLE-Screaming-carved-skull-accompanied-human-sacrifices.html