Kalmar "Genus Bombycilla" tana nufin rabe-raben nazarin halittu da ake amfani da su a fagen ilimin dabbobi. A cikin wannan tsarin rarrabawa, “Genus” wani matsayi ne na haraji da ake amfani da shi wajen haɗa nau’o’in jinsin da ke da alaƙa da juna, yayin da “Bombycilla” sunan wani takamaiman jinsin tsuntsaye ne. Cedar Waxwing (Bombycilla cedrorum), da Bohemian Waxwing (Bombycilla garrulus), da Jafananci Waxwing (Bombycilla japonica). Wadannan tsuntsayen an san su da nau’ukan tsutsotsinsu, sumul jiki, da son ‘ya’yan itace, wadanda suke cinyewa da yawa a cikin watannin hunturu. waɗanda ke raba wasu halaye na zahiri da ɗabi'a kuma an rarraba su tare don nazarin kimiyya da fahimta.