What animal were flutes made out of in Shang dynasty?

The xun (simplified Chinese: 埙; traditional Chinese: 塤; pinyin: xūn; Cantonese = hyun1) is a globular, vessel flute from China. It is one of the oldest musical instruments in China and has been in use for approximately seven thousand years.[] The xun was initially made of baked clay or bone, and later of clay or ceramic. It is the only surviving example of an earth (also called "clay") instrument from the traditional "eight-tone" (bayin) classifications of musical instruments (based on whether the instrument is made from metal, stone, silk, bamboo, gourd, earth, hide, or wood