Charles Robet Darwin, mulela dia dikumi ne ibidi ngondu muibidi tshidimu tshia tshinunu nkama muada mukulu ne tshitemba ne mufwe dia dikumi ne tshitemba ngondu muinayi tshidimu tshia tshinunu nkama tshitemba makumi muada mukulu ne ibidi .Udi mwena bukebikebi pa malu aa dilubuluka dia bifukibwe. Mmutamba kabidi kumanyibwa bwa bukebikebi bwebbde bwa malu aa mwinshi mwa buloba.
