Wooden whistle.
This instrument was collected in Nigeria by Mercedes Mackay, who wrote about it in article published in 1950: 'The whistle flute of the Ibo is…complicated in design It can be carved in wood or moulded in clay, and although some varieties are seven inches long, others are almost circular in shape. The player blows through an open flu, and the sound is made by the fingers stopping the hole in the side of the instrument. There are no other stops, but an astonishing variety of pitch can be achieved by the movements of the fingers over the side hole This flute plays a big part in Ibo music and is heard a great deal during road building and tree felling.'