Nakuba kungezona zonke izingane ezizalwa zinamehlo aluhlaza, izingane eziningi ezinemelanin ephansi zingase zizalwe zinamehlo aluhlaza azoba mnyama kamuva. Njengoba ziba ne-melanin eyengeziwe emehlweni ngenxa yezinto ezifana nokuchayeka ekukhanyeni, amehlo azo angase abe mnyama. Izingane ezizalwa zinesikhumba esimnyama sezivele zine-melanin eyengeziwe, okwenza kube lula ukuthi zizalwe zinamehlo amnyama.
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