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The gray whale is the only living member of the baleen whale family Eschrichtiidae. The gray whale differs from the other two baleen whale families primarily in its feeding behavior - it is a bottom feeder.

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BBC One - Planet Earth Live, Series 1, Episode 8, The Gray whale's journey

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Watch the ordeals faced by Gray whale mothers and their calves during their annual migration north.

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We  Migrate to escape and avoid war.

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Generation means that people from that time.

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They migrate to Canada so they get the weather they need.

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They get there three days after rain because there are so they get wet.

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Wildebeests migrate around the Serengeti Plains.

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Larva make their way back to New Zealand by drifting on ocean current

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They move to sea to migrate.

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At the start of their life and the end.

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They know how to migrate because of the temperature they are at.

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Whales migrate to down south to go back.

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Animals move in different places which is called migrations.