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Monarch
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Why are the monarchs going to the northeast? It's easy to see why spring vegetation could be a barrier when viewing this satellite image of the Eastern United States in April. Notice the line where spring green-up has occurred. Keep in mind that the prevailing winds blow from west to east. Now imagine the monarchs pushing northward — but encountering this limit of vegetation growth — and so moving to the northeast with the help of the wind. |
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