Birds Are Vanishing From North America

The number of birds in the United States and Canada has declined by 3 billion, or 29 percent, over the past half-century, scientists find. THE NEW YORK TIMES The skies are emptying out. The number of birds in the United States and Canada has fallen by 29 percent since 1970, scientists reported on Thursday. There are 2.9 billion fewer birds taking wing now than there were 50 years ago. The analysis, published in the journal Science, is the most exhaustive and ambitious attempt yet to learn wh...
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