Brown is the natural fur color for an animal. Fur is the hair covering of non-human mammals, particularly those mammals with extensive body hair that is soft and thick. The stiffer bristles on animals such as pigs are not generally referred to as fur. An animal with commercially valuable fur is known within the fur industry as a furbearer.
The use of fur as clothing or decoration is considered controversial by some people: most animal welfare advocates object to the trapping and killing of wildlife, and to the confinement and killing of animals on fur farms. Mammals with reduced amounts of fur are often called "naked", as with the naked mole-rat, or "hairless", as with hairless dogs.