Going South and observing… (2)

Animal migration remains one of the great puzzles of nature, yet 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 weight less that  1 ounce, can navigate across Canada to the Maritime Provinces and New England every autumn, then fly non-stop 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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