Igbo-Ora, Nigeria. Soon they’ll be offering fertility vacation packages, no doubt.
The rate of identical twins is pretty steady throughout the world at about 0.5 percent of all births, according to a 1995 study by Belgian researcher Fernand Leroy, who has worked extensively on twins.
Overall, almost 5 percent of all Yoruba births produce twins, the Belgian study said, compared with just around 1.2 percent for Western Europe and 0.8 percent for Japan — although fertility drugs in the developed world are changing those figures.
http://news.yahoo.com/s/afp/20071112/wl_africa_afp/nigeriafamilytwins
http://www.bbc.co.uk/worldservice/people/highlights/010607_twins.shtml
