Polycephaly can also occur in humans. You may have heard of Abigail and Brittany Hensel, conjoined twins who share a body; in humans, this is known as dicephalus parapagus dipus. Speaking of twins ...

Polycephaly occurs when an organism has multiple ... average amount of a body part or as two beings sharing a body. When humans have the condition, one of two situations can occur.

The rare condition of being born with two heads, known as Polycephaly, occasionally occurs in the animal kingdom. There has only ever been one recorded case of a human surviving with the condition.

SeaWorld notes that nests that are disturbed by humans or animal predators before hatching have a 25 percent or less chance of success. The condition of a two-headed animal is called polycephaly ...