Where are all the birds?
12 percent of existing species — about 1,250 — are threatened with extinction by 2100.
Up until now, scientists had documented the extinction of about 130 bird species since the year 1500. But the study’s authors — from Stanford University, Duke University and the Missouri Botanical Garden in St. Louis — say the more accurate estimate is about 500 extinctions out of more than 10,000 known bird species. That would be about one extinction per year over the last 500 years.