Bristles are stiff, short hairs or fibers that can be found on various objects, including brushes and animals. In brushes, bristles are typically made from materials like nylon, polyester, or natural fibers such as hog hair. They are designed to help with cleaning, painting, or grooming by effectively reaching into crevices and removing dirt or applying substances. In animals, bristles refer to the coarse hairs found on certain species, such as pigs or hedgehogs. These bristles serve various functions, including protection, insulation, and sensory perception. The structure and arrangement of bristles can vary significantly among different animals, adapting to their specific environments and needs.