The world's twins capital, Located in Oyo State, Nigeria 🇳🇬 Igbo Ora is well-known for a remarkably large number of twin births. The town records an average of 50 multiple births in 1000 live births. This phenomenon of numerous twin births is not unique to Igbo-Ora; it has also been observed in the town of Kodinji in India 🇮🇳 and Cândido Godói in Brazil 🇧🇷.

Many of the local Yoruba people believe their consumption of yams and okra leaves to be the cause of their high birth rate of twins. While some fertility experts believe that certain yams contain a natural hormone that could cause multiple ovulation