How is the hole bored out?
A- Termites or White Ants as they are nicknamed, make their nest under the ground ,inside or on the tree or in mounds above ground with complex natural airconditioning to make life comfortable in the hot terrrain they live. The termites eat the heart wood out leaving the alive sap wood to grow on, enabling the tree to live to full maturity whilst being hollowed out on the inside. In classic dry country /termite terrain, the smallest of trees can be perfectly hollowed out on the inside. Or a large tree can have 30 + branches each potentially a perfect didgeridoo. Mostly there is a range from being solid to partially eaten to fully eaten, and a didg finder drives ,walks and searchs far afield looking for ideal didgs.