This is the blowing end of a Didgeridoo.
The didgeridoo (also known as a didjeridu or didge) is a wind instrument developed by Indigenous Australians of northern Australia at least 1,500 years ago and is still in widespread usage today both in Australia and around the world. It is sometimes described as a natural wooden trumpet or “drone pipe”. Musicologists classify it as an aerophone. The instrument is traditionally made from Eucalyptus trees which have had their interiors hollowed out by termites.
The hand painted decoration cover the whole length.