wierd_world on Instagram: "two-headed snakes are real, though they are extremely rare. ​This condition is called bicephaly (meaning "two heads") or polycephaly, and it's a type of conjoined twinning. ​Here are the key facts about them: ​Cause: It results from a developmental anomaly where a single snake embryo begins to split into identical twins but fails to separate completely, leaving two heads on one shared body. This is similar to how conjoined twins occur in humans. ​Rarity: This happens v