Two Headed Snakes

Craniopagus parasiticus - parasitic twin head with an undeveloped (or underdeveloped) body attached to the head of a developed twin:
- In 1783, the "Two-Headed Boy of Bengal" was born in India; the second head was joined roughly upside-down on top of the developed twin's head. The boy survived until 1787 and was killed by snakebite.
- In 2003, Rebeca Martinez was born in the Dominican Republic with an extra head but died 7 hours after surgery at the age of 8 weeks.
- In 2004, Egyptian Naglaa Mohamed gave birth to Manar Maged who had the head and undeveloped torso of another child attached. In 2005, the second head was removed, and later that year Naglaa appeared on the Oprah Winfrey show with her surviving child. Manar died from a brain infection in 2006.