Psychological warfare and Aztec death whistles? They produce intimidating human screams

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When odd, skull-shaped grave items were found by archaeologists decades ago at an Aztec temple in Mexico, they were assumed to be mere toys or ornaments, and were catalogued and stored in warehouses. However, years later, experts discovered they were creepy 'death whistles' that made piercing noises resembling a human scream, which the ancient Aztecs may have used during ceremonies, sacrifices, or during battles to strike fear into their enemies.

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Quijas Yxayotl, a musician who plays an array of traditional Mexican Indian Civilizations instruments, demonstrates an Aztec death whistle.

Two skull-shaped, hollow whistles were found 20 years ago at the temple of the wind god Ehecatl, in the hands of a sacrificed male skeleton. When the whistles were finally blown, the sounds created were described as terrifying. The whistles make the sounds of "humans howling in pain, spooky gusts of whistling wind or the 'scream of a thousand corpses" writes MailOnline.

Quetzalcoatl, the feathered serpent god, combined with the attributes of Ehecatl, deity of the wind. The wind instruments may have been linked with this god. Gwendal Uguen/Flickr

Roberto Velázquez Cabrera, a mechanical engineer and founder of the Mexico-based , has spent years recreating the instruments of the pre-Columbians to examine the sounds they make. He writes in MexicoLore that the death whistle in particular was not a common instrument, and was possibly reserved for sacrifices - blown just before a victim was killed in order to guide souls to the afterlife- or for use in battle.

"Some historians believe that the Aztecs used to sound the death whistle in order to help the deceased journey into the underworld. Tribes are said to have used the terrifying sounds as psychological warfare, to frighten enemies at the start of battle," explains Oddity Central. If the whistle was used during battles, the psychological effect on an enemy of a hundred death whistles screaming in unison might have been great, unhinging and undermining their resolve.

Illustration of Aztec Warriors as found in the Codex Mendoza. Public Domain

Other types of ancient noisemakers have been found made from different materials, such as feathers, sugar cane, clay, and frog skin.

A zoomorphic whistle from Mexico, circa 200 B.C. - A.D. 500. Public Domain

reports that some experts think the ancients used the different tones to send the brain into certain states of consciousness, or even to manage or treat illnesses. Some of the replica whistles created by Cabrera make sounds and tones reaching the top range of human hearing, almost inaudible to us.

An expert in pre-Hispanic music archaeology, Arnd Adje Both told "My experience is that at least some pre-Hispanic sounds are more destructive than positive, others are highly trance-evocative. Surely, sounds were used in all kind of cults, such as sacrificial ones, but also in healing ceremonies."

Roberto Velázquez Cabrera notes that although pre-Columbian music has been lost to us in modern times, the sounds of recreated whistles can be used to give us a better understanding of the ancients. He said, "We've been looking at our ancient culture as if they were deaf and mute. But I think all of this is tied closely to what they did, how they thought."