Double Vision By Bob Kurt

In contrast, a fetus which develops alone in the womb is called a singleton, and the general term for one offspring of a multiple birth is multiple.
Twins are estimated to be approximately 1.9% of the world population, with monozygotic twins making up 0.2% of the total - and 8% of all twins.
The twin birth rate in the United States is slightly above 32 twin live births per 1,000 live births, while the Yoruba have the highest rate of twinning in the world, at 45 twins per 1,000 live births, possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may stimulate the ovaries to release an egg from each side.