US and Canada have lost three billion birds since 1970

https://www.theguardian.com/environment/blog/2019/sep/19/us-canada-bird-population-losses

More than one in four birds have been lost across diverse groups and habitats, in what researchers describe as a ‘wake-up call’

The US and Canada have lost more than one in four birds – a total of three billion – since 1970, culminating in what scientists who published a new study are calling a “widespread ecological crisis”.

Researchers observed a 29% decline in bird populations across diverse groups and habitats – from songbirds such as meadowlarks to long-distance migratory birds such as swallows and backyard birds like sparrows.

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Original Title: US and Canada have lost three billion birds since 1970
Full Text of the Original Article: https://www.theguardian.com/environment/blog/2019/sep/19/us-canada-bird-population-losses