The didgeridoo (traditionally known as the yidaki or mandapul) is a wind instrument developed by Indigenous Australians in northern Australia. It is made from hollowed-out eucalyptus branches, naturally bored out by termites. Performers use a technique called 'circular breathing' to maintain a continuous drone for long periods. This involves breathing in through the nose while simultaneously pushing air out of the mouth using the cheeks. The sound of the didgeridoo is complex, consisting of a fundamental low frequency and various overtones produced by the player's vocalizations and tongue movements. It is used in ceremonies, dancing, and storytelling, often mimicking the sounds of the Australian bush, such as kookaburras or dingoes. While it appears simple, mastering the instrument requires immense breath control and the ability to rhythmically manipulate the timbre while maintaining the constant drone.