The Cookiecutter Shark is famous for its gruesomely efficient parasitic attacks on whales, seals and big fish. But that is only a part of the story when it comes to this extraordinary, and extraordinarily bright, shark ... 

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

Modified versions of: Icy Interlude [feat. Mystified], Uncertainty and Left Behind by Nova Beat Estate, CC BY 4.0; Lightless Dawn by Kevin Macleod (incompetech.com), CC BY 4.0.