Adeusa nhwehwɛmufoɔ a wɔfiri Princeton University a ɛwɔ Amɛrika ne Uppsala University a ɛwɔ Sweden kaa sɛ saa nnomaa foforɔ pueeɛ bɛyɛ mfeɛ kakra akyi, mmom wɔgye di sɛ saa nsusuiɛ no akyɛ kakra deɛ, ɛnam mmoawa Darwin finch, Geospiza fortes, aboawa cactus finch a wabɛfra mu ne Geospiza conirostris awoɔ nnidisoɔ.