Skins, feathers, and furs have been used since prehistoric times to create a wide range of items, including clothing, blankets, and coverings for objects like furniture and books. These materials vary greatly in their properties depending on the animal source and the methods used in processing and finishing. Their preservation requires careful attention, especially in the case of feathers, where conservation focuses on preventing damage from insects, light, and improper handling, along with delicate repair and cleaning techniques.