Polycephaly
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Polycephaly is the condition of having more than one head. The term is derived from the Greek stems poly meaning "many" and kephalē meaning "head". A polycephalic organism may be thought of as one bei
The Tocci Brothers, c. 1881
A (female) case of Dicephalus parapagus.
Drawing of the eighteenth century Boy of Bengal, affected by craniopagus parasiticus.
Skeletal structure in a case of dicephalus parapagus dipus. From: Hirst & Piersol, 1893.
Diprosopus
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Diprosopus, also known as craniofacial duplication, is an extremely rare congenital disorder whereby parts or all of the face are duplicated on the head.
Polycephaly
…poorly developed and malformed, and not "participate" much. Where twinning of the head itself is only partial, it can result in the condition known as diprosopus—one head with two faces. The February 22, 2007, issue of the journal Biology Letters detailed the discovery of a 122 million-year-old fossil of a…
A chick with two beaks and three eyes
Spanish case of diprosopus, born 1775
An example of a "Janus cat"