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NARRATOR: The migrating humpbacks
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have only one objective now, the safe house of Mozambique.
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It's a whale-birthing paradise far from the usual hunting
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grounds of great white sharks.
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Vulnerable baby whales can nurse, grow, and gain strength.
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The adults have traveled 4,000 miles to safety.
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The warm water and lack of predators
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give their species the best chance of survival.
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[whale singing]
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It's a magical time.
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The whales spend up to four months mating,
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birthing, and nursing their young.
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[soothing music]
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This is their time to bond and interact.
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But these adult whales have not eaten since they
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left Antarctica months ago.
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Their strength diminishes each day,
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and the time is coming when all of the adults and calves
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will have to swim the 4,000 miles back to Antarctica
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to feed.
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Now, after four months up in Mozambique,
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they start this return migration down,
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and that's when it's going to get really interesting.
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Because at that stage, you're going
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to have these weak whales, these whales that haven't fed
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up enough that have been starved for the last four or five
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months.
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And as they go down, they're going
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to be the ones that, I think, are really
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vulnerable to attack by sharks.