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Amazing Migration of the Monarch Butterfly

Monarch butterflies migrate by the millions. As many as 300 million monarchs will make the trip from northern areas of the continent to California and Mexico.
Every autumn, the largest migration of insects begins. Monarch butterflies are the only insect to travel thousands of miles from the cooler north to the warmth of southern regions to spend the winter. What may be most amazing about this migration is not just the distance, but the fact that it takes four generations of monarch butterflies to make the trip and that the butterflies -- four generations apart -- use the exact same trees to winter each year.
The most popular places for monarch butterflies to spend the summer are in Mexico in oyamel fir trees, and near Pacific Grove, California where they live in eucalyptus trees. No one yet knows how the butterflies are able to find the exact same trees their ancestors used during hibernation.