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A new comprehensive study of North American bird populations shows that nearly one in three birds, or 29%, has vanished in the last half-century. This amounts to a total of nearly 3,000,000,000 fewer birds existing today than in 1970. Is this simply encroachment of humans on bird habitats, the use of deadlier pesticides that can coat plant parts that birds eat, or something even more sinister?
ClosedNicola asked 4 years ago • 
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