Erayga "naasley fiix ah" waxa loola jeedaa koox naasley ah oo leh cago leh suulasha goonida ah kuwaas oo inta badan ku qalabaysan cidiyo. Kooxdan waxaa ka mid ah naasleyda hilibleyda ah sida eeyaha, bisadaha, weasels, orso, iyo raccoons, iyo sidoo kale qaar ka mid ah cayayaanka iyo omnivores. Magaca "fissiped" wuxuu ka yimid ereyga Laatiinka "fissus," oo macneheedu yahay "kala qaybsanaan," iyo "pes," oo macneheedu yahay "cag."