 Kafukufuku yemwe anachitika ku Princeton University ku America ndi ku Uppsala University ku Sweden zikuonetsa kuti mitundu yina ya zamoyo yapezeka mu mibado yiwiri. Ngakhale izi zimatenga nthawi yayitali zedi chifukwa choberekana pakati Darwin finch, ma Geospiza forte ndi ma cactus finch wobwera , komanso Geospiza conirostris. 