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Monarchs reach the oyamel fir forests in central Mexico, where they cluster tightly together to survive the winter.
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In August to September monarchs in the northern U.S. and Canada start flying south and build up fat reserves for the long journey.
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Monarchs move through the central United States, relying on warm temperatures and helpful wind patterns.
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Cooler weather slows them down, and nectar becomes harder to find as they reach southern states.
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Monarchs reach the oyamel fir forests in central Mexico, where they cluster tightly together to survive the winter.
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Newly born generations continue the north journey into the Midwest, Northeast, and Canada.
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Late-summer monarchs develop into the long-lived “super generation” that will migrate all the way back to Mexico in fall.
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Warming temperatures wake them from overwintering. They mate and begin flying north, laying eggs on milkweed in the southern U.S.