Natural fiber

Plant fiber has two origins: plant or animal.
Plant fiber is mainly made of cellulose and extracted from either seeds (cotton, kapok,) stems and roots (linen, hemp, jute,) leaves (abaca, sisal) or sap (rubber.)
Animal fiber is mostly made of proteins and comes from certain mammals’hair (alpaca, angora, cashmere, wool, mohair, vicuna…) or silk made by silkworms.