Dolphins - Deep Thinkers? English Subtitles

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Since ancient times, dolphins
have held a special appeal for us.

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But it's only now,

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that we're beginning to uncover
the secrets of their private lives.

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They're warm blooded mammals
like ourselves

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and have a brain than
in proportion to their body

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is one of the largest in the animal kingdom.

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They have a playful nature.

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They also have a reputation
for being highly intelligent.

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But are they really that smart?