Body feathers are an essential part of bird anatomy, providing insulation, waterproofing and aerodynamics. When it comes to describing these feathers, there are several synonymous options to choose from, each with its own connotations. Plumage, for instance, suggests an overall coat of feathers, while pelage commonly refers to mammalian fur but can also be used as an alternative term for feathers. Crest, hackles and mane all refer to specific types of feathers on particular parts of the body, while down and fluff generally encompass the soft, fine feathers that are used for insulation. Ultimately, the choice of synonym will depend on the context and the speaker's preferred style.