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Werewolves aren't real.

But stay with me for a moment.

While I tell you about the spade foot frogs, specifically they're tadpoles,

which just might be the closest thing to werewolves in nature.

I want to tell you about the bizarre and true story of cannibal tadpoles. I'm Brian Gutierrez, and this is Scientific Americans' Science Quickly.

Spadefoot tadpoles are born as peaceful bottom feeders that eat little bits of algae and poo floating in the water.

But under the right conditions, each tadpole has a chance to transform into a hulking, agile predator.

And the first thing on the menu are other tadpoles.

And I have some right here.

I'm in the office of David Fenning, on the third floor of the biology department at the University of North Carolina at Chapel Hill.

So what you're seeing here is I'm showing you a little vial filled with ethanol and it's got some tadpoles in it.

And some of these tadpoles you see are small.

Some of the tadpoles you see are large.

Oh, okay.

So this is one of the huge ones.

Yeah, and so that huge one is what we call the carnivore morph.

Learning about the carnivore morph, what I think of as a tadpole werewolf, is why I came to see David.

...