While monarch butterflies may be relatively small in size, they make one of the most epic journeys known to animal-kind. During the spring, the first generation of butterflies leaves its winter home in Mexico or California to head north. Each successive generation flies even farther north, ending with the fourth generation finally making it to its summer destination in the northern United States or Canada. When the time comes to head south again for the winter, the fourth generation makes the entire journey back by itself, returning to almost exactly the same spot from which the first generation took off, even though the fourth generation has never been to that location before and there are no earlier surviving generations around to show the way.
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