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NARRATOR: The ragged tooth
shark holds its secrets close.

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This is an after-dark
mating rendezvous.

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Scars are the only evidence.

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This female bears teeth
marks from males holding on.

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But mating makes her hungry.

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Her needle-like
teeth don't slice.

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They impale.

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Her eyes are tiny, so she relies
on her electromagnetic sense

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to find food.

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Black spots on
her face are sacks

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of jelly that pick up vibrations
given off by other fish.

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If you have a heart
beat, there's no hiding.

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Flat fish like sole and flounder
are practically invisible,

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but she's an expert
at finding them.

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[music playing]