Polycephaly: The Rare Phenomenon Of Multi-Headed Animals

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Those of you who are chronic users of TikTok (welcome to the gang) may have seen an unusual animal video doing the rounds this week: a two-headed calf. It’s a condition known as polycephaly, and although it’s widespread in mythology, it’s much rarer in reality. What is polycephaly? The term polycephaly stems from the Greek poly, meaning many or multiple; and kephalē, meaning head. As seen in the calf from the video, it is usually a case of an organism with a single body and two heads, known as bicephaly or dicephaly, although cases of tricephaly have been – perhaps...