Willow-bark flute.

https://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~21450~103140/full/150,/0/default.jpghttps://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~75034~183522/full/150,/0/default.jpg