Occasionally, hollow branches are used as end-blown flutes (like the Terran nay from the Middle East or the mobeke from the Central Africa) but like the whizzer, their construction (with one finger hole at the most) limits their use melodically. These are usually played by children or provide additional ornamentation during social dances.
Hufwe instruments require a moving column of air to produce a sound. For example, the whizzer is simply a blade of grass or leaf held loosely between the fingers or the teeth. When blown across, the thin strip of vegetation vibrates rapidly to produce a high-pitched whistle. The cat ear planimal is often used. An exceptionally skilled player can produce a basic melody, but most of the time the whizzer is used to enliven social dances with brief but frequent whistles. (Read more)