Kodinhi is a village in India known for twins
Wikipedia:
The village is noted for having a high twinning rate although India has one of the lowest twinning rates in the world
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Despite several studies being conducted, the exact cause of this phenomenon is yet to be ascertained. Women from Kodinhi married off to far away places are also known to give birth to twins
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This phenomenon of a large number of twin births is not unique to Kodinhi, and has also been observed in the town of Igbo-Ora in Nigeria