Chris Merkord Posted June 21, 2013 Share Posted June 21, 2013 National Geographic North American Birds Declining as Threats Mount National Geographic Increasingly, though, both casual bird-watchers and ornithologists note a steady decline in numbers—not just of endangered species, but also of common birds not usually considered to be at risk. Study after study, survey after survey show a worrisome ... Are birds worth the billions?The Conversation all 26 news articles » View the full article Link to comment Share on other sites More sharing options...
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