Only the central pair are attached (via ligaments) to the tail bones; the remaining rectrices are embedded into the rectricial bulbs, complex structures of fat and muscle that surround those bones.
Só o par central está unido (por ligamentos) aos ósos da cola; as restantes rectrices están incrustadas nos bulbos rectriciais, estruturas complexas de graxa e músculo que rodean eses ósos.