Animal hair is a type of natural fiber that grows on the bodies of various mammals. It serves several purposes, including insulation, protection, and sensory functions. Common examples of animals that have hair include dogs, cats, and horses. The structure of animal hair can vary significantly between species, affecting its texture and appearance. Hair is composed mainly of a protein called keratin, which is also found in human hair and nails. It can be used in various products, such as clothing, upholstery, and brushes. Different types of animal hair, like wool from sheep or cashmere from goats, are valued for their unique properties and warmth.