What is the didgeridoo made out of?

They are usually made from hardwoods, especially the various ucalyptis species that areendemic to the region.Sometimes a native bamboo, such as Bambusa amhemica, or pandanus is used. Generally the main trunk of the tree is harvested, though a substantial branch may be used instead. Aboriginal didgeridoo craftsmen hunt for suitably hollow live trees in areas with obvious termite activity.