GREAT MIGRATIONS. “The monarch butterfly is able to migrate thousands of miles across the North American continent, a journey so long that it incredibly requires at least two generations to complete it! No less baffling is the migratory behavior of some other animals: for example, the Manx shearwater, a fast-flying seabird, that can glide and plane its way to breeding grounds across the Atlantic Ocean, and the Pacific salmon that returns to the very stream where it was hatched after 2 years of wandering thousands of miles at sea.”
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