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CNN article on migration of birds (NON DINO)

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Loss of Forests Hold up Early Birds, Study Finds
The findings by Peter Marra of the Smithsonian Institution and
colleagues at Dartmouth University and the Canadian Wildlife Service
could shed light on why so many bird populations are in decline. 

"We've found that the quality of the winter habitat affects not only
when birds fly north to the breeding grounds but what condition they're
in upon arrival," Marra said in a statement. 

"Both are crucial factors in how well the birds do on their summer
breeding grounds."