 Vatsvakurudzi vekuPrinceton University muUnited States uye Uppsala University muSweden vakataura kuti pane zvimwe zvakashanduka muzvizvarwa zviviri chete, kunyange zvazvo zvaimbonzi zvinotora nguva yakareba, zvichibva pakuberekana kwakaitika pakati peDarwin finch, Geospiza fortes uye cactus finch, Geospiza conirostris. 