Traditional didgeridoos are unique because they are not 'built' in the traditional sense, but harvested. They are made from eucalyptus branches or trunks that have been hollowed out by live termites. In the dry Northern Territory of Australia, termites eat the heartwood of the trees because it is dead and easier to digest than the living outer layers. Aboriginal people search for these trees, tapping the trunks to find ones that sound hollow. Once a suitable branch is found, it is cut, cleaned out with a stick or water, and the exterior is stripped of bark and often painted with traditional designs. A wax mouthpiece made of stingless bee wax is often added to the blowing end to make it more comfortable and to create an airtight seal for the player's lips. This natural 'manufacturing' process ensures that every traditional didgeridoo has a completely unique internal shape and sound.