sentences:  Skin sewing is artistic arena in which Yup'ik women and a few younger men excel.Yup'ik women made clothes and footwear from animal skins (especially hide and fur of marine and land mammals for fur clothing, sometimes birds, also fish), sewn together using needles made from animal bones, walrus ivory, and bird bones such as front part of a crane's foot and threads made from other animal products, such as sinew.The semilunar woman's knife ulu is used to process and cut skins for clothing and footwear.