Doctors are trying to unravel the mystery of an Indian village boasting 250 sets of twins born to just 2,000 families.

The phenomenon has seen almost six times as many twins born than the global average in the remote village of Kodinhi, in Kerala.

In 2008 alone 15 pairs of twins were born in the village out of 300 healthy deliveries and this year is expected to top that number.

In the last five years alone up to 60 pairs of twins have been born, with the rate of twins increasing year-on-y...