A recent dig at a Late Jomon site in Hokkaido has yielded a remarkable collection of bird-shaped clay flutes (tsuchibue). Unlike common household tools, these instruments were found clustered in a sacred pit near a communal hearth, suggesting they were used for a specific ritual purpose. Researchers believe these flutes were central to a "Wind-Calling" festival intended to summon the southerly breezes of spring and drive away the harsh northern winters.
Acoustic tests on 3D-printed replicas of the flutes show they produce haunting, high-pitched whistles that mimic the calls of migratory swans. This discovery highlights the profound connection between Jomon seasonal festivals and the observation of local wildlife, reinforcing the idea of a spiritual heritage deeply rooted in the ecological rhythms of the Japanese archipelago.