has quality has quality capable of part of capable of part of temperature homeostasis plumose feather down feather natal down feather Wikipedia:Down_feather A feather lacking a vane and having a rudimentary rachis and a tuft of non-interlocked barbs with elongated barbules extending from the calamus. powder down feather downy feather UBERON:0008291 body down feather plumulaceous feather plumaceous feather vaned feather