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Conjoined twins are identical twins whose bodies are physically joined together while still inside their mother’s uterus. There are many different ways in which twins can be joined; some are joined at the head, others at the side or torso, and still others along the spine or pelvis. Conjoined twins have been reported throughout history, but they are very uncommon, with statistics suggesting that only one birth in anywhere from 50,000 to almost 200,000 will produce conjoined twins. In the nineteenth and twentieth centuries, conjoined twins were also known popularly as Siamese twins. This is because a pair of conjoined twins from Siam (now known as Thailand), Chang and Eng Bunker, became famous after touring with the circus owned by P. T. Barnum. The world famous circus billed them as the renowned Siamese Twins, so people began to use that term to describe any set of conjoined twins.