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- [Narrator] To tag a shark,

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first, we have to catch a shark.

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We go fishing for sharks.

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Sharks are very good at finding food.

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So we get the sharks' attention

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by putting the food they like

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in the water.

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You can see a big dead
fish next to our boat

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and the shark in the background.

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When we have the shark,

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we work quickly to place the tag

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on its dorsal fin,

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and then set it free again.

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Placing the tag is like
piercing someone's ear,

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but we use a drill to make two holes.

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We know where to make the holes,

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so this really doesn't bother the shark.

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- [Man 1] Ah.

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- [Man 2] He did not even flinch.

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- [Man 1] No, they never do.

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- [Narrator] Once the tag is secure,

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we let the sharks swim away.

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But now we can watch where it goes

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for the next few months.

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(speakers sound bubble and static noise)