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While the birth rate of monozygotic—identical—twins is relatively constant worldwide, the rate for dizygotic—fraternal—twins varies widely. Fraternal twins are most common among persons of African ancestry, and the highest incidence of fraternal twins is among the Yoruba peoples of Nigeria, with a frequency of more than 40 per 1,000 births. This has made twins an important part of Yoruba culture, in which twins are said to share one soul. What traditions do the Yoruba follow regarding twins? Discuss
Source: The Free Dictionary