The didgeridoo is an ancient wind instrument developed by Indigenous Australians. Traditionally, it is made from a eucalyptus branch that has been naturally hollowed out by termites. The player produces a low-frequency drone by vibrating their lips against the mouthpiece, often using beeswax to create a comfortable seal. A hallmark of didgeridoo playing is 'circular breathing'—inhaling through the nose while simultaneously pushing air out of the mouth using the cheeks. This allows for a continuous, unbroken sound. Beyond the drone, players use their voices to mimic animals like kookaburras or dingoes. Interestingly, modern medical studies have shown that playing the didgeridoo can help treat sleep apnea by strengthening the muscles of the upper airway.