Millie and Christine McKoy
Millie McCoy and Christine McCoy (July 11, 1851 – October 8, 1912) were American conjoined twins who went by the stage names "The Carolina Twins", "The Two-Headed Nightingale" and "The Eighth Wonder of the World".
Millie and Christine were born on July 11, 1851, to Jacob and Monemia McKoy who were slaves of a North Carolina blacksmith, Jabez McKay.  The McKay farm was near the town of Whiteville, North Carolina, which resulted in the girls also being referred to as The Carolina Twins. Prior to the sisters' birth, their mother had borne seven other children, five boys and two girls, all of ordinary size and form. 
The twins were first sold at 10 months of age to South Carolinian, John C. Pervis.  Pervis and McKay reached an agreement where Pervis exhibited the girls for pay and then paid a percentage to McKay. Fourteen months after the original sale, they were sold to a showman, Brower, who had the backing of a wealthy merchant named Joseph Pearson Smith.  Brower first exhibited the twins at North Carolina's first state fair, held in 1853. The North Carolina state fair was a success for Brower and The Carolina Twins, however Brower's fortune changed over the next months. Brower was conned by a Texas adventurer, who offered land worth an estimated forty-five thousand dollars as a purchase price for the twins.  Brower accepted, sent the twins on to the Texan, and then waited several days for the deeds before realizing that he had been swindled. Brower returned to North Carolina to relate the loss to Joseph Pearson Smith. Since Brower was left destitute, Smith was given the promissory note and was now the owner of The Carolina Twins. Mille and Christine were handled by several managers before being reclaimed by Smith in Britain in 1857. 
On 1 January 1863 the Emancipation Proclamation ended their slave status and they were no longer anyone's property.
Smith traveled to Britain to collect the girls and brought with him their mother, Monemia, from whom they had been separated. He and his wife provided the twins with an education and taught them to speak five languages, dance, play music, and sing. For the rest of the century, the twins enjoyed a successful career as "The Two-Headed Nightingale", and appeared with the Barnum circus. In 1869, a biography on the twins, titled History and Medical Description of the Two-Headed Girl, was sold during their public appearances.
- Martell, Joanne. "Mille-Christine: Fearfully and Wonderfully Made". John F. Blair, Publisher, 2000, p. 4.
- From 'Monsters' to Modern Medical Miracles, 2008-06-21.
- Waukesha Daily Freeman; Waukesha, Wisconsin; Thursday, June 29, 1882.
- Biographical Sketch of Millie Christine, the Carolina Twin, Surnamed the Two-Headed Nightingale and the Eighth Wonder of the World. Cincinnati: Hennegan & Co. Print, published between 1902 and 1912
- Fayetteville Observer; January 16, 2000.
- Fayetteville Observer; March 1, 2001.
- Millie-Christine: Fearfully and Wonderfully Made; Joanne Martell; John F. Blair Publisher (2001)
- Philadelphia Daily News; February 5, 2003.
- The History of the Carolina Twins: Told in "Their Own Peculiar Way" by "One of Them." Buffalo: Buffalo Courier Printing House, 18??
|Wikimedia Commons has media related to Millie and Christine McKoy.|
- Biographical Sketch of Millie Christine, the Carolina Twin, Surnamed the Two-Headed Nightingale and the Eighth Wonder of the World. Cincinnati: Hennegan & Co. Print, [between 1902 and 1912].
- American National Biography Online: Millie and Christine McCoy