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Where have the wild birds gone? 3 billion fewer than 1970
By Seth Borenstein & Christina Larson
Bird populations in US and Canada down 3bn in 50 years
By Victoria Gill
More than a quarter of all birds have disappeared from North America since 1970
By Brian Resnick
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Opinion | The Crisis for Birds Is a Crisis for Us All (Published 2019)
By Peter P Marra & John W. Fitzpatrick
Bird Population In North America Has Plummeted In Past 50 Years
By Nell Greenfieldboyce
North America has lost 3 billion birds since 1970
By Emily Chung
We've lost 3 billion birds since 1970 in North America
By Jonathan Lambert
North America Has Lost Nearly 3 Billion Birds Since 1970
By Rachael Lallensack
Birds Are Vanishing From North America
By Carl Zimmer
North America has lost 3 billion birds in 50 years
By Karin Brulliard