Igbo-Ora, the scientific enigma of the ‘twin capital of the world’

The small Nigerian city of Igbo-Ora boasts a unique title: the “twin capital of the world.” A stroll through its streets, in this territory of nearly 200,000 inhabitants, reveals an unusual presence of identical twins walking, shopping, or playing in the squares. While globally there are around 12 twin births per 1,000 deliveries, according to a 2021 study published in the journal Human Reproduction, the proportion in this city in southwestern Nigeria is much higher.

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