Medically reviewed by Renita White, MD Conjoined twins occur when identical twins have fused bodies before they are born. This condition has also been known as "Siamese twins," named after the first ...

Conjoined twins occur once in every 200,000 live births. Many are not separable, Strauch said, and, depending on how they are joined, one twin often must die. "Maybe half can be separated ...

I now report briefly the results of morphological observations on sei whale Siamese twins found on the Japanese whaling factory ship Nisshin Maru (Taiyo Fisheries Co.) in the Antarctic whaling ...