Are you thinking of going South? (2)

Animal migration remains one of the greatest puzzles of nature.  The last five years have brought an unprecedented scientific quest to understand it.  Biologists want to know how blackpoll warblers, songbirds that live in Alaska and weigh less than one ounce, can navigate across Canada to the Maritime Provinces and New England every autumn, then fly nonstop to South America, 2400 miles away.

Scientists hope to learn how monarch butterflies flutter 2000 miles every September from New England to a single grove of trees on a Mexican mountain.  And they are studying how fish find their natal streams 1200 miles across featureless oceans.





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