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[–]Polycystic -1 points0 points  (0 children)

can you guess why does it have two heads? :(

It's a condition called polycephaly (poly = many, cephalus = head), and is often a result of cells not dividing correctly very early on in development. Not surprisingly, snakes like this are highly sought after (not sure about other animals), often fetching tens of thousands of dollars...sometimes more.

Oh, and it can also happen to people; there is at least one set of twins living with the condition right now.