Flatworms are infamous in biology labs for their surreal ability to regenerate heads when you decapitate them . Now, researchers have discovered that an odd developmental defect can cause them to grow heads at both ends – and it only gets weirder from there.

The extraordinary regenerative abilities of some species of flatworms defy belief. Chop them in half, and you'll end up with two whole flatworms, as each piece grows a new head, tail, or whatever else is missing. They're like miniature mythological Hydras .

Past research revealed an electrical current can determine if their regrowth at a certain point will be head or a tail, allowing scientists to create two-headed or two-tailed flatworms.

Or however the heck many heads this poor monstrosity ended up with.

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