Lemming years are important for far more than just predators

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The number of lemmings varies greatly from year to year. Why is it like this, and what happens if lemming years happen less often?
Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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Lemming years are important for far more than just predators
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